c语言 5-11

#include <stdio.h>

int main(void)
{
    int i, j, a[6][2];
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            printf("a[%d][%d] = ", i, j); scanf("%d", &a[i][j]); 
        }
    }
    puts("show the matrix form of 6 row 2 col array.");
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            printf("%4d", a[i][j]);
        }
        putchar(‘\n‘);
    }
    
    int sumchi = 0, summath =0;
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            if( j == 0)
                sumchi += a[i][j];
            else
                summath += a[i][j];
        }
    }
    printf("sumchi = %d\n", sumchi);
    printf("summath = %d\n", summath);
    
    int c[6]= {0};
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            c[i] += a[i][j];    
        }
    }
    
    for(i = 0; i < 6; i++)
    {
        printf("the sum = %d  the mean = %.2f\n", c[i], (double)c[i] / 2);
    }
    
    return 0;
}