题解 | #计算某字母出现次数#

#include "stdio.h"
#include "string.h"

#define cmp ('a'-'A')


int main(void)
{
    char str[1024]={0},C='\0';
    int count=0;
    fgets(str,sizeof(str), stdin);
    scanf("%c",&C);
    for(int i=0;i<strlen(str);i++)

        if((str[i]-C)==0)
            count++;
        else
            if((C>='A')&&(C<='Z')&&((str[i]-C)==cmp))
               count++;
            else
               if((C>='a')&&(C<='z')&&((C-str[i])==cmp))
                count++;
    printf("%d",count);
    return 0;
}