题解 | #计算某字符出现次数#

#include <stdio.h>

int main()
{
    char asciiArray[37] = {0};
    char input;
    while (scanf("%c", &input))
    {
        if (input == '\n')
            break;
        else if (input == ' ')
            continue;
        else if (input <= '9')
            asciiArray[input - '0'] ++;
        else if (input <= 'Z')
            asciiArray[input - 'A' + 10] ++;
        else  // case: input <= 'z'
            asciiArray[input - 'a' + 10] ++;
    }
    scanf("%c", &input);
    int retval;
    if (input <= '9')
        retval = asciiArray[input - '0'];
    else if (input <= 'Z')
        retval = asciiArray[input - 'A' + 10];
    else 
        retval = asciiArray[input - 'a' + 10];
    printf("%d", retval);
}