001、
#include <stdio.h> int main(void) { int a = 10; double b = 5.5; printf("a = %f\n", a); ## %f输出int型 printf("b = %d\n", b); ## %d输出double型 return 0; }
区别01;
#include <stdio.h> int main(void) { int a = 10; int b = 5; printf("mean = %d\n", (a + b)/2); ## (a + b)/2 首先转换为整型,然后输出,而不是%d输出int型 return 0; }
区别02:
#include <stdio.h> int main(void) { double a = 3.8; double b = 5.5; int c; c = (a + b)/2; printf("mean = %d\n", (a + b)/2); ## %d不能输出浮点型 printf("mean = %d\n", c); ## 此时的c已经为int型, 可以输出 return 0; }