摘要： [练3-1]不需要；因为已经涵盖了所有可能的条件。[练3-2]#include<stdio.h>int main(void){int y;double x;printf("Enter x:");scanf("%lf",&x);if(x<0)y=-1;else if(x==0)y=0;elsey=1;printf("y=sign(%f)=%d\n",x,y);return 0;}[练3-3]#inc... 阅读全文

摘要： 【例2-1】#include<stdio.h>int main(void){printf("Hello World!\n");return 0;}【例2-2】#include<stdio.h>int main(void){printf("Programming is fun.\n");printf("And Programming in C is even more fun!\n");return... 阅读全文

摘要： 【练2-1】#include<stdio.h>int main(void){printf("Programming in C is even more fun!\n");return 0;}【练2-2】printf("Programming is fun. And Programming in C is even more fun!\n");#include<stdio.h>int main(vo... 阅读全文