题解 | #计算某字符出现次数#

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

int main(){
char str[1000];
char key;

scanf("%[^\n]",&str);
scanf(" %c",&key);
 
int len = strlen(str);

int count = 0;
if ((key>= 48)&&(key<=57)){
  for (int i = 0; i < len; i++) {
    if (str[i] == key){
        count++;
    }
}
} else {
  for (int i = 0; i < len; i++) {
    if (str[i] == key || str[i] == key+32 || str[i]+32 == key){
        count++;
    }
  }
}


 printf("%d\n",count);
 
}