《C语言第三版课后习题》6课后习题8.2求方程ax^2+bx+c=0的根，用三个函数gz，ez和sz分别求当b^2-4ac大于0、等于0和小于0时的根，并输出结果。从主函数输入a、b、c的值。（输出保留3位小数）#include<stdio.h>#include<math.h>float x1, x2, disc, p, q;void gz(float a, float b){ float m = sqrt(disc); x1 = (-b + sqrt(disc)) / (2 * a); x2 = (-b - sqrt(disc)) / (2 * a);}void ez(float a, float b){ x1 = x2 = (-b) / (2 * a);}void sz(float a, float b){ p = -b / (2 * a); q = sqrt(-disc) / (2 * a);}int main(){ int a, b, c; scanf("%d %d %d", &a, &b, &c); disc = b*b - 4 * a*c; if (disc > 0) { gz(a, b); printf("x1=%.3f x2=%.3f\n", x1, x2); } else if (disc == 0) { ez(a, b); printf("x1=%.3f x2=%.3f\n", x1, x2); } else { sz(a, b); printf("x1=%.3f+%.3fi x2=%.3f-%.3fi\n", p, q, p, q); } return 0;}