题解 | #计算某字符出现次数#

#include<stdio.h>
#include<string.h>
//将所有字母转换成大写
int main()
{

    char str[1000] = {0};
    gets(str);
    char option = '0';
    scanf("%c",&option);
    int len = strlen(str);
    int i = 0;
    int count = 0;
    for(i = 0; i < len;i++)
    {
        if(str[i] <='z'&&str[i]>='a')
        {
            str[i] =str[i]-32;
        }
    }
    if(option<='z'&&option>='a')
    {
        option= option-32;
    }
    
    for(i = 0; i < len;i++)
    {
        if(str[i] == option)
        {
            count++;
        }
    }
    
    printf("%d",count);
    return 0;
}