题解 | #计算某字符出现次数#

#include <stdio.h>

int main() {
    char string[5000];
    char ch1,ch2;
    int count=0;
    gets(string);
    scanf("%c",&ch1);
    if(ch1>='A'&&ch1<='Z') ch2=ch1+32;
    else if(ch1>='a'&&ch1<='z') ch2=ch1-32;
    else ch2=ch1;
    for(int i=0;i<strlen(string);i++){
        if(string[i]==ch1||string[i]==ch2) count++;
    }
    printf("%d\n",count);
    return 0;
}