#include <stdio.h>
#include <stdlib.h>
#include<string.h>
int main(){
int n[1000000],i;
int x,all=0.;
int ave;
while(scanf("%d",&x)!=EOF){
for(i=1;i<=x;i++){
scanf("%d",&n[i-1]);
}
for(i=1;i<=x;i++){
all=all+n[i-1];
}

ave=all/i;
if(ave>59){printf("yes\n");}
if(ave<59){printf("no\n");}
}

return 0;
}
# c語言練習
###### tags: `computer`
>判斷是否為等腰三角形 c語言

#include<stdio.h>
int main()
{   int x,y,z,tootla1,tootla2,tootla3;
    printf("enter the number\n");
    scanf("%d%d%d",&x,&y,&z);
    tootla1=x+y;
    tootla2=x+z;
    tootla3=y+z;
    if(tootla1>z&&tootla2>y&&tootla3>x){
        if(x==y&&x==z&&y==z){
            printf("ture truangle\n");
        }
        else if(x==y||x==z||z==y){
            printf("isocoles triangle\n");
        }
        else{
            printf("not a isocoles triangle\n");
        }
    }
    else if(x==0|z==0|y==0){
        printf("can not be a triangle\n");
    }
    else{
        printf("can not be a triangle\n");
    }
    return 0;
}

>直角三角形 c語言

#include<stdio.h>
int main()
{
    int a,b,c;
    printf("enter the number\n");
    scanf("%d%d%d",&a,&b,&c);
    if(a+b>c&&b+c>a&&a+c>b){

        if(a^2+b^2==c^2|a^2+c^2==b^2|b^2+c^2==a^2){
            printf("this is a 90 triangle\n");
        }
        else{
            printf("this is not a 90 triangle\n");
        }
    }
    else{
        printf("can not be a triangle\n");
    }

    return 0;
}

>判斷能圍出甚麼三角形

#include<stdio.h>
int main()
{
    int a,b,c;
    printf("enter the number\n");
    scanf("%d%d%d",&a,&b,&c);
    if(a+b>c&&b+c>a&&a+c>b){

        if(a==b&&b==c&&a==c){
            printf("ture triangle\n");
        }
        else if(a==b|b==c|a==c){
            printf("also triangle\n");
        }
        else if(a*a+b*b==c*c|a*a+c*c==b*b|b*b+c*c==a*a){
            printf("90 triangle\n");
        }
        else{
            printf("triangle\n");
        }
    }
    else{
        printf("can not be a triangle\n");
    }

    return 0;
}

>判斷三數大小找出最大值

#include<stdio.h>
int main()
{
    int x,y,z,max;
    printf("please enter three number\n");
    scanf("%d%d%d",&x,&y,&z);
    max=x;
    if(max<=y){
       max=y;
    }
    if(z>=y){
        max=z;
    }
    printf("the max number is%d\n",max);


    return 0;
}

>四個數字比大小找最大值

#include<stdio.h>
int main()
{
    int x,y,z,a,max;
    printf("enter four number\n");
    scanf("%d%d%d%d",&x,&y,&z,&a);
    max=x;
    if(y>max){
        max=y;
    }
     if(z>max){
        max=z;
    }
     if(a>max){
        max=a;
    }

    printf("the max number is%d\n",max);


    return 0;
}

>switch首次練習

#include<stdio.h>
int main()
{
    int x,y;
    scanf("%d",&x);
    switch(x){
    case 29:
        printf("harry\n");
        break;
    case 33:
        printf("fat\n");
        break;
    default:
        printf("no body\n");
        break;
    }
    return 0;
}

>猜數字練習

#include<stdio.h>
int main()
{
    int x ;
    int harry=29;
    int count=0;
    while(count==0||x!=harry ){
        printf("enter the number：");
        scanf("%d",&x);
        count=count+1;
        if(x>harry ){
            printf("too big\n");
        }

        if(x<harry){
            printf("too small\n");
        }
    }
   printf("you are right\n");

    return 0;
}

>求平均

#include<stdio.h>
int main()
{
    int sum=0;
    int number;
    int count=0;
    float average;
    printf("enter the number：");
    scanf("%d",&number);
    if(number==0){
       printf("can not be a sentance");
    }
        else{
    while(number!=0){
         count=count+1;
         sum=sum+number;
         printf("enter the number：");
         scanf("%d",&number);
    }
    average=(float)sum/count;
    printf("average is %f",average);
        }

    return 0;
}

>switch練習

#include<stdio.h>
int main()
{
    int x;
    int tootle=0;
    do{
        printf("enter the count： ");
        scanf("%d",&x);
        switch(x){
            case 1:tootle=tootle+10;
            break;
            case 2:tootle=tootle+20;
            break;
            case 3:tootle=tootle+30;
            break;
            case 4:tootle=tootle+40;
            break;
        }
    }
    while(x!=0);
    printf("the tootle is %d",tootle);
    return 0;
}

>計算加法 使用者自行輸入數字幾加到幾

#include<stdio.h>
int main()
{
   int x=0,i,t,s;
   printf("enter the number1:");
   scanf("%d",&t);
   printf("enter the number2:");
   scanf("%d",&s);
   for(i=t;i<=s;i++){
   x=x+i;
   }
    printf("%d",x);
    return 0;
}

>數星星

#include<stdio.h>
int main()
{
    int x,t;
    printf("enter the number of star you like:");
    scanf("%d",&x);
    for(t=1;t<=x;t++){
    printf("*");
    }

    return 0;
}

>找質數

#include<stdio.h>
int main()
{
   int x,number,y=0;
   printf ("enter the number:");
   scanf("%d",&x);
   for(number=1;number<=x;number++){
        if(x%number==0){
            y=y+1;
        }
    }
    if(y==2){
        printf("this is the number can not found another number with it\n");//質數
    }
    else{
        printf("this is the number can  found another number with it\n");//不是質數
    }
    return 0;
}

>c語言 九九乘法表

#include <stdio.h>
int main()
{
    int x,y,number;
    printf("enter the number:");
    scanf("%d",&number);
    for(x=number;x<=9;x++){
        for(y=1;y<=9;y++){
        printf("%d x %d = %d\n",x,y,x*y);
        }
    }
    return 0;
}

>c語言 輸出空心正方形

#include <stdio.h>
int main()
{
    int x,t,a;//a是橫排的第幾個,t是直排的第幾個,x是輸入的變數
    printf("enter the number:");
    scanf("%d",&x);
    for(a=1;a<=x;a++){
        printf("*");
    }
    printf("\n");
    for(a=1;a<=x-2;a++){
        printf("*");
        for(t=1;t<=x-2;t++){
            printf(" ");
        }
        printf("*");
        printf("\n");

    }
     for(a=1;a<=x;a++){
        printf("*");
    }
    printf("\n");
}

>列出空心三角形

#include <stdio.h>
int main()
{
    int x,t,a;
    printf("enter the number:");
    scanf("%d",&x);
    printf("*\n");
    for(a=0;a<=x-3;a++){
        printf("*");
        for(t=1;t<=a;t++){
            printf(" ");
        }
        printf("*\n");
    }
    for(a=1;a<=x;a++){
        printf("*");
    }

    return 0;
}

>猜數字使用亂數生成題目

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int x;
    int y=rand()%10;
    printf("enter the number you guess:");
    scanf("%d",&x);
    while(x!=y){
        if(x>y){
        printf("too big\n");
           }else{
           printf("too small\n");
           }
        printf("enter the number you guess:");
        scanf("%d",&x);
    }
    printf("you are right\n");
    return 0;
}

>查詢數字的練習

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    int i,n[5];
    for(i=1;i<5;i++){
        printf("%d:",i);
        scanf("%d",&n[i-1]);
    }
    while(1){
    printf("Q =");
    scanf("%d",&i);
    if(i==0){
        break;
    }
    printf("%d\n",n[i-1]);
    }
    return 0;
}

>查詢範圍內的數字

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    int i,n[10];
    for(i=1;i<11;i++){
        printf("enter the number:");
        scanf("%d",&n[i-1]);
    }
    int l,r;
    printf("L R ");
    scanf("%d%d",&l,&r);
    if(i==0||r==0){
        break;
    }
    for(i=1;i<11;i++){
        if(n[i-1]>=l&&n[i-1]<=r){
        printf("%d ",n[i-1]);
    }
    }
    return 0;
}

>查詢上限內最大數的練習

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    int i,n[10];
    for(i=1;i<11;i++){
        scanf("%d",&n[i-1]);
    }
    int updata,max=0;
    printf("updata: ");
    scanf("%d",&updata);
    for(i=1;i<11;i++){
        if(n[i-1]<updata&&n[i-1]>max){
        max=n[i-1];
        }
    }
    printf("%d",max);
    return 0;
}

>畫出統計長條圖

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    int i,x;
    int n[10]={0};
    for(i=1;i<=10;i++){
        scanf("%d",&x);
        n[x-1/10]++;
    }
    int j;
    for(i=1;i<=10;i++){
        printf("%3d:",i*10);
        for(j=1;j<=n[i-1];j++){
                printf("*");
        }
        printf("\n");
    }


    return 0;
}

>找出最大值與平均數與總和

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#include<math.h>
int main(){
    int max=0,x;
    int tootle=0;
    for(int i=1;i<=10;i++){
        printf("enter the number:");
        scanf("%d",&x);
        tootle=tootle+x;
        if(x>=max){
            max=x;
        }
    }
    printf("%d\n",max);
    printf("tootle is %d\n",tootle);
    int average=tootle/10;
    printf("average is %d\n",average);

    return 0;
}

>找出最大值與平均數與總和可擴充版

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    int n[10]={0},max=n[0],i,average;
    int tootle=n[0];
    for(int i=0;i<=9;i++){
        printf("enter the number:");
        scanf("%d",&n[i]);
    }
    for(i=0;i<=9;i++){
        if(max<=n[i]){
           max=n[i];
        }
    }
    for(i=0;i<=9;i++){
        tootle=tootle+n[i];
    }
    printf("%d\n",max);
    printf("tootle is %d\n",tootle);
    average=tootle/10;
    printf("average is %d\n",average);

    return 0;
}

>產生不重複的亂數

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int x,n[10]={0},i;
    for(i=1;i<=9;i++){
        do{
          x=rand()%10+1;
        }while(n[x-1]!=0);
        printf("%d",x);
        n[x-1]++;
    }
    printf("\n");
    return 0;
 }

>使用交換法產生不重複的亂數

 #include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int i,n[10];
    for(i=1;i<=10;i++){
        n[i-1]=i;
    }
    for(i=1;i<=10;i++){
        int j=rand()%(11-i)+i;
        int t=n[i-1];
            n[i-1]=n[j-1];
            n[j-1]=t;
        printf("%d",n[i-1]);
    }
    printf("\n");
    return 0;
 }

>泡沫排序法

 #include <stdio.h>
#include <stdlib.h>
#include<time.h>
int main()
{
    int n[10],i;
    for(i=1;i<=10;i++){
        printf("enter the number:");
        scanf("%d",&n[i-1]);
    }

    int j;
    for(i=1;i<=10;i++){
       for(j=1;j<=10;j++){
         if(n[j-1]>n[j]){
            int a;
            a=n[j-1];
            n[j-1]=n[j];
            n[j]=a;
        }
       }
    }

    for(i=1;i<=10;i++){
        printf("%d\n",n[i-1]);
    }
    return 0;
}

>陣列的複製與隨機產生

#include <stdio.h>
#include <stdlib.h>
#include<time.h>
int main()
{
    srand(time(0));
   int n[10]={0},x[10]={0},i;
   for(i=1;i<=10;i++){
    n[i-1]=rand();
   }

   for(i=0;i<=9;i++){
    x[i]=n[i];
   }
   for(i=1;i<=10;i++){
   printf("%d ",n[i-1]);
   }
   printf("\n");
   for(i=1;i<=10;i++){
   printf("%d ",x[i-1]);
   }
    return 0;
}

>使用函式輸出一串陣列再輸出最大值

#include <stdio.h>
#include <stdlib.h>
#include<time.h>

int main(){
    srand(time(0));

    int arrayrand(int n[10]);
    int arrayprintf(int n[10]);
    int arraymax(int n[10]);

    int n[10],i,max;

    arrayrand(n);
    arrayprintf(n);
    arraymax(n);
    return 0;
}

int arrayrand(int n[10]){
    int i;
    for(i=1;i<=10;i++){
        n[i-1]=rand()%10;
    }
}

int arraymax(int n[9]){
    int j,i,t;
    for(i=1;i<=10;i++){
       for(j=1;j<=10;j++){
            if(n[j-1]>n[j]){
             t=n[j-1];
             n[j-1]=n[j];
             n[j]=t;
            }
       }
    }
    printf("%d",n[9]);
}

int arrayprintf(int n[10]){
    int i;
    for(i=1;i<=10;i++){
        printf("%d ",n[i-1]);
    }
    printf("\n");
}

>在函式間傳遞陣列

#include <stdio.h>
#include <stdlib.h>
#include<time.h>

int maxv(int e[],int n);

int main(){
    int n[3]={1,2,3444};
    printf("%d\n",maxv(n,3));
    int a[6]={4,5,6,7,8,9999999};
    printf("%d\n",maxv(a,6));
    return 0;
}

int maxv(int e[],int n){
    int i,max;
    max=e[0];
    for(i=1;i<n;i++){
        if(e[i]>max){
            max=e[i];
        }
    }
    return max;
}

>輸出從鍵盤讀入的數字

#include <stdio.h>
#include <stdlib.h>
#include<time.h>
int array_printf(char n[]);
int array_scanf(char n[]);

int main(){
    char n[10],i;
    printf("please enter the world :");
    array_scanf(n);
    array_printf(n);
}

int array_scanf(char n[]){
    int i;
    for(i=0;i<=99999999;i++){
        scanf("%c",&n[i]);
            if(n[i]=='\n'){
                break;
            }
    }
}

int array_printf(char n[]){
    int i;
    for(i=0;n[i]!='\n';i++){
        printf("%c",n[i]);
    }
    printf("\n");
}

>指標與陣列練習

#include <stdio.h>
#include <stdlib.h>
#include<time.h>

int main(){
    int n[5];
    int *p;
    for(p=n;p!=n+5;p++){
        *p=0;
        printf("%d",*p);
    }


    return 0;
}

>難 使用malloc動態配置記憶體

#include <stdio.h>
#include <stdlib.h>
#include<time.h>

int main(){
    int *n;
   int j,count=0,x;
   while(1){
        scanf("%d",&x);
        if(x==0){
            break;
        }
        int* a=malloc(sizeof(int)*(count+1));
        for(j=0;j<count;j++){
           a[j]=n[j];
        }
        n=a;
        n[count]=x;
        count++;
   }
   for(j=0;j<count;j++){
        printf("%d\n",n[j]);
   }
   printf("\n");
    return 0;
}

>輸入不定個數字串的練習

#include <stdio.h>
#include <stdlib.h>
#include<time.h>
#include<string.h>

int main(){
    int i=0;
    char input[10],n[100][5];
    while(1){
        scanf("%s",input);
        if(strcmp(input,"end")==0){
            break;
        }
       strcpy(n[i],input);
        i++;
    }
    int j;
    for(j=0;j<=i;j++){
        printf("%s ",n[j]);
    }


   printf("\n");
    return 0;
}