c语言中数字字符计数

c语言中数字字符计数

1、

#include <stdio.h>

int main(void)
{
    int i, ch;
    int cnt[10] = {};
    
    while((ch = getchar()) != EOF)
    {
        switch(ch)
        {
            case '0': cnt[0]++; break;
            case '1': cnt[1]++; break;
            case '2': cnt[2]++; break;
            case '3': cnt[3]++; break;
            case '4': cnt[4]++; break;
            case '5': cnt[5]++; break;
            case '6': cnt[6]++; break;
            case '7': cnt[7]++; break;
            case '8': cnt[8]++; break;
            case '9': cnt[9]++; break;
        }
    }
    
    puts("show the times.");
    for(i = 0; i < 10; i++)
    {
        printf("'%d' = %d
", i, cnt[i]);
    }
    
    return 0;
}

 

2、

#include <stdio.h>

int main(void)
{
    int i, ch;
    int cnt[10] = {};
    
    while((ch = getchar()) != EOF)
    {
        switch(ch)
        {
            case 48: cnt[0]++; break;
            case 49: cnt[1]++; break;
            case 50: cnt[2]++; break;
            case 51: cnt[3]++; break;
            case 52: cnt[4]++; break;
            case 53: cnt[5]++; break;
            case 54: cnt[6]++; break;
            case 55: cnt[7]++; break;
            case 56: cnt[8]++; break;
            case 57: cnt[9]++; break;
        }
    }
    
    puts("show the times.");
    for(i = 0; i < 10; i++)
    {
        printf("'%d' = %d
", i, cnt[i]);
    }
    
    return 0;
}

3、

#include <stdio.h>

int main(void)
{
    int i, ch;
    int cnt[10] = {};
    
    while((ch = getchar()) != EOF)
    {
        if(ch >= 48 && ch <= 57)
        {
            cnt[ch - 48]++;
        }
    }
    
    puts("show the times.");
    for(i = 0; i < 10; i++)
    {
        printf("'%d' = %d
", i, cnt[i]);
    }
    
    return 0;
}

4、

#include <stdio.h>

int main(void)
{
    int i, ch;
    int cnt[10] = {};
    
    while((ch = getchar()) != EOF)
    {
        if(ch > '0' && ch < '9')
        {
            cnt[ch - '0']++;
        }
    }
    
    puts("show the times.");
    for(i = 0; i < 10; i++)
    {
        printf("'%d' = %d
", i, cnt[i]); 
    }
    
    return 0;
}