c语言 5-11

1、

#include <stdio.h>

int main(void)
{
    int i, j, a[6][2];
    puts("please input the elements of the array.");
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            printf("a[%d][%d] = ", i, j); scanf("%d", &a[i][j]);
        }
    }
    puts("\n show the matrix form of array a.");
    for(i = 0; i < 6; i++)
    {
        for(j = 0; j < 2; j++)
        {
            printf("%4d", a[i][j]);
        }
        putchar('\n');
    }
    
    int chisum = 0, mathsum = 0;
    for(i = 0; i < 2; i++)
    {
        for(j = 0; j < 6; j++)
        {
            if (i == 0)
                chisum += a[j][i];
            else
                mathsum += a[j][i]; 
        }
    }
    printf("\nchisum = %d; chimean = %.2f\n", chisum, (double)chisum / 6);
    printf("mathsum = %d; mathmean = %.2f\n\n", mathsum, (double)mathsum / 6);
    
    int b[6][1] = {0};
    for(i = 0; i < 6; i++)
    {
        for(j  = 0; j < 2; j++)
        {
            b[i][0] += a[i][j];
        }
        printf("sum major %d: %d,  mean: %.2f\n", i + 1, b[i][0], (double)b[i][0] / 2);
    }
    return 0;
}