笔试题：Suggest a simple and fast way to multiply the input integer digit by 7。
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翻译：不使用乘法运算，使用简单且快捷的方式实现输入的数字乘以7。
解决方案：
#include "stdio.h"int main(int argc, char **argv ){ int a; printf("Please Input Your Number:\n"); scanf("%d", &a); printf("Before Multiplying, the number is:%d\n", a); int b=( (a<<3)-a ); printf("Caculation Results is:%d.\n", b);}运行效果：
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