1、
#include <stdio.h>
int main(void)
{
int a[4][3] = {{50,60,40},{80,70,60},{60,70,70},{90,80,70}};
int b[4][3] = {{40,60,80},{20,70,90},{60,80,90},{50,20,40}};
int i, j;
int sum[4][3];
for (i = 0; i < 4; i++)
{
for (j = 0; j < 3; j++)
{
sum[i][j] = a[i][j] + b[i][j];
}
}
puts("first examination");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 3; j++)
{
printf("%d ", a[i][j]);
}
putchar('\n');
}
puts("-------------\n-------------");
puts("second examination");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 3; j++)
{
printf("%d ", b[i][j]);
}
putchar('\n');
}
puts("-------------\n-------------");
puts("sum");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 3; j++)
{
printf("%d ", sum[i][j]);
}
putchar('\n');
}
return 0;
}