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# [C語言] b516. 凱撒密碼-商競103 ## C語言 ## 觀念: 1. getchar是在<stdlib.h>底下 2. ASCII code用法要背熟 3. input=(input-65+3)%26+65; - $-65$ 代表要將 $65$|-----|$90$ 改成 $0$|-----|$25$ A|-----|Z     A|-----|Z - $+3$ 代表加密 $0$|-----|$25$ 改成 $3$|-----|$28$ A|-----|Z    A|-----|Z - $+65$ 代表要將 $3$|-----|$28$ 改成 $68$|-----|$67$ A|-----|Z     A|-----|Z ## AC程式碼: ``` #include<stdio.h>/* for printf and scanf */ #include<stdlib.h>/* for getchar */ int main(){ int a=0,i=0; char input; while(scanf("%d",&a)!=EOF){ for(i=0;i<a;i++){ while((input=getchar())!=EOF){ if(input>=65 && input<=90){ input=(input-65+3)%26+65; printf("%c",input); } else{ printf("\n"); } } } } return 0; } ``` Reference: [1] [b516. 凱撒密碼-商競103](https://zerojudge.tw/ShowProblem?problemid=b516)
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