C语言中出现了这个问题 [Error] 'else' without a previous 'if'_百 ...答:include "stdio.h"main(){float x;int y;printf("x:\n");scanf("%f,&x");if (x>0)//多了一个分号{y=1;printf("x=%f,y=%d" ,x,y);}else{if(x==0){y=0 ;printf("x=%f,y=%d" ,x,y);}else{//少了一组括号y=-1; printf("x=%f,y=%d",x,y);}}return 0;} ...