哥德巴赫猜想，4~1000=素数之和并输出

# include <stdio.h> int su(int a) {int b,i; b = 0;for (i = 2;i <= a / 2;i++){if (a % i == 0){b = 1;break;}}return b; } int main() {int i, j,a;for (i = 4;i <= 1000;i = i + 2){for (j=2;j<=i/2;j++){a = i - j;if (su(j) == 0 && su(a) == 0){printf("%d=%d+%dn", i, j, i - j);break;}}}return 0; }