c语言8-9

#include <stdio.h>

int main(void)
{
    int ch;
    int time[1] = {};
    
    while((ch = getchar()) != EOF)
    {
        switch(ch)
        {
            case ‘\n‘: time[0]++; break;
        }
    }
    
    printf("the row:  %d\n", time[0]);
    
    return 0; 
}

#include <stdio.h>

int main(void)
{
    int ch;
    int a = 0;
    
    while((ch = getchar()) != EOF)
    {
        if(ch == ‘\n‘)
            a++;
    }
    
    printf("row: %d\n", a);
    
    return 0;
}

#include <stdio.h>

int main(void)
{
    int ch;
    int a[1] = {};
    
    while(1)
    {
        ch = getchar();
        if(ch == EOF)
            break;
        switch(ch)
        {
            case ‘\n‘: a[0]++; break;
        }
    }
    
    printf("rows: %d\n", a[0]);
    return 0;
}

#include <stdio.h>

int main(void)
{
    int ch;
    int a = 0;
    
    while(1)
    {
        ch = getchar();
        if(ch == EOF)
            break;
        if(ch == ‘\n‘)
            a++;
    }
    
    printf("rows: %d\n", a);
    
    return 0;
}