#include "stdio.h" #define N 100 int main() { char s[N]; printf("Input a string:\n"); scanf("%s",s); int i,up[26]={0},down[26]={0}; for(i=0;i='A' && s[i]<='Z') // 大写字母 up[ s[i]-'A' ]++; else if(s[i]>='a' && s[i]<='z') //小写字母 down[ s[i]-'a' ]++; else { // 其它 出错 printf("What you input is not a valid string,error--> %c\n",s[i]); return 0; } } printf("The result is as follows:\n"); for(i=0;i<26;i++) { if(up[i]!=0) printf("%c----%d\n",i+'A',up[i]); if(down[i]!=0) printf("%c----%d\n",i+'a',down[i]); } return 0; }
