题目：一个整数，若加上100后是一个完全平方数，若加上168还是一个完全平方数，请问该数是多少？
分析：不知道这数字大小是多少，不知道这样的数字有几个，程序写起来效率不会高。开始写成while(x
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #include <stdio.h> #include <limits.h> int main(void) { unsigned short x=0; //符合条件的数字 unsigned short y; unsigned short z; do { y=sqrt(x+100); //取(x+100)的平方根 z=sqrt(x+168); //取(x+168)的平方根 if(y*y==x+100&&z*z==x+168) //判断是否符合条件 { printf(" %d ",x); //打印这个数字 } x++; //累加x }while(x<SHRT_MAX); return 0; } |
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