printf不支持%lf
1 #include <stdio.h> 2 3 int square137(int n); 4 5 void p137() { 6 double x = 3.0; 7 int y = (int)x; 8 printf("Square of %f is %d ", x, square137(y)); 9 } 10 11 int square137(int n) { 12 return n * n; 13 }
如果你吧%f改为%lf的话，输出就会出乎你的意料，试试便知
1 #include <stdio.h> 2 3 int square137(int n); 4 5 void p137() { 6 double x = 3.0; 7 int y = (int)x; 8 printf("Square of %f is %d ", x, square137(y)); 9 } 10 11 int square137(int n) { 12 return n * n; 13 }
如果你吧%f改为%lf的话，输出就会出乎你的意料，试试便知