分解质因数

</pre><pre name="code" class="html">//输入一个数，分解质因数
#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
int x;
int i;

scanf("%d",&x);
printf("%d = ",x);

for (i = 2; i <= x; i++)
{
if (x % i == 0 )
{
x = x / i;
printf("%d",i);
if (x == 1)
{
break;
}
i--;
printf(" x ");
}
}
printf("\n");
}
return 0;
}
//结果：
//56
//56 = 2 x 2 x 2 x 7
//Program ended with exit code: 0