#include<stdio.h>
#include<stdlib.h>
main()
{
    int A[3][6]={0};
    int i=0,j=0,k=0;
    while(i<3)
    {
        j=0;
        while(j<4)
        {
            printf("學生%d的第%d的小考成績:",i+1,j+1);
            scanf("%d",&A[i][j]);
            j++;
        }
        i++;
    }
    i=0;
    while(i<3)
    {
        j=0;
        printf("學生%d小考分別多少:",i+1);
        while(j<4)
        {
            printf("%d ",A[i][j]);
            j++;
        }
        printf("\n");
        i++;
    }
    i=0;
    while(i<3)
    {
                j=0;
                while(j<4)
                {
                          A[i][4]=A[i][4]+A[i][j];
                          j++;
                }
                i++;
    }
    i=0;
    while(i<3)
    {
        j=0;
        while(j<5)
        {
            if(j==0)
              printf("%d",A[i][j]);
            else if(j==4)
              printf("=%d\n",A[i][j]);
            else
              printf("+%d",A[i][j]);
            j++;
        }
        i++;
    }
    i=0;
    while(i<3)
    {
          j=0;
          while(j<4)
          {
              if((A[i][j]<60))
                 k++;
              j++;   
        }
        i++;
    }
    printf("不及格%d個\n",k);
    system("pause");
}

只能印總共有幾個不及格

#include<stdio.h>
#include<stdlib.h>
int main() {
    int A[3][6]= {0};
    int i=0,j=0,k=0;
    while(i<3) {
        j=0;
        while(j<4) {
            printf("學生%d的第%d的小考成績:",i+1,j+1);
            scanf("%d",&A[i][j]);
            j++;
        }
        i++;
    }
    i=0;
    while(i<3) {
        j=0;
        printf("學生%d小考分別多少:",i+1);
        while(j<4) {
            printf("%d ",A[i][j]);
            j++;
        }
        printf("\n");
        i++;
    }
    i=0;
    while(i<3) {
        j=0;
        while(j<4) {
            A[i][4]=A[i][4]+A[i][j];
            j++;
        }
        i++;
    }
    i=0;
    while(i<3) {
        j=0;
        while(j<5) {
            if(j==0)
                printf("%d",A[i][j]);
            else if(j==4)
                printf("=%d\n",A[i][j]);
            else
                printf("+%d",A[i][j]);
            j++;
        }
        i++;
    }
    i=0;
    while(i<3) {
        j=0;
        int n=0;
        while(j<4) {
            if(A[i][j]<60)
                {
                k++;
                n++;
                }
                
            j++;
        }
        printf("学生%d不极格个数%d\n",i+1,n);
        i++;
    }
    printf("不及格%d個\n",k);
    return 0;
}

結果是累積上去的