1 /* 2     二进制乘法 3 */ 4 #include <stdio.h> 5 #include <stdlib.h> 6 #define LEN 64        //因子二进制位数的两倍，32位乘法结果不会超过64位 7  8 int main() 9 {10     unsigned int a = 0x13131313;11     unsigned int b = 0x23232323;12     unsigned int p = 0x00000001;13     unsigned int temp = 0;            14     unsigned int flags;                //用于判断做加法时是否溢出15     int i;16     int rlt[LEN] ={0};                //结果数组17     18     for(i=0; i<LEN; i++)                //主循环19     {20         flags = 0;21 22         if(b&p)                        //判断是否需要做加法23         {24             flags = temp;25             temp += a;26         }27 28         rlt[i] = (int) temp & 1;    //最低位丢弃，并保存至数组29         if(temp < flags)            //判断是否溢出30             temp += 0x80000000;31 32         temp >>= 1;                    //右移结果33         p <<= 1;34     }35 36     i = LEN-1;37     while(rlt[i] == 0) i--;            //丢弃结果前面的038     for(; i>=0; i--)                //打印结果39         printf("%d", rlt[i]);40 41     printf("\n");42     43     return EXIT_SUCCESS;44 }45 #ifdef RESULT 46 D:47 cd Cprogram48 gcc axb.c49 (echo #ifdef RESULT & doskey /history & a.exe & echo #endif) >> ./axb.c50 101001111000111001110101010110101111010000001101001001100151 #endif