<pre><code>
include <stdio.h>
int main()
{
int a[5][5], i, j;
for (i = 0; i < 5; ++i)
{
printf("Enter row %d: ", i+1);
for (j = 0; j < 5; ++j)
{
scanf("%d", &a[i][j]);
}
}
int sumrow = 0, i2, j2;
printf("Row totals: ");
for (i2 = 0; i2 < 5; ++i2)
{
for (j2 = 0; j2 < 5; ++j2)
{
sumrow = sumrow + a[i2][j2];
}
printf("%d ", sumrow);
sumrow = 0;
}
printf("\n");
printf("Column totals: ");
int sumcolumn = 0, i3, j3;
for (j3 = 0; j3 < 5; ++j3)
{
for (i3 = 0; i3 < 5; ++i3)
{
sumcolumn += a[i3][j3];
}
printf("%d ", sumcolumn);
sumcolumn = 0;
}
return 0;
}
</code></pre>
实现结果：
Paste_Image.pngNote:
<code>for (int i = 0, i < count, ++i)</code>
这种在for函数内定义变量的用法只有C99中可用。gcc默认为C89，编译失败。