一个方程的根
#include<stdio.h>float Q_gen(float c);void main(){ float X1,y; X1=3; y=Q_gen(X1); if(y<0) { X1=(X1+0.1); y=Q_gen(X1); } printf("方程的根为%f",X1);}float Q_gen(){ float c; float y; y=c*(c*(c-c*5)+16)-80; return(y);}为什么if语句循环...