软2梁晨1223400244.zip

#include<stdio.h> #include<math.h> void f1(int a, int b, int c); void f2(int a, int b, int c); void f3(int a, int b, int c); int main() { int a, b, c; double t; printf("请输入a b c\n"); scanf("%d %d %d", &a, &b, &c); printf("原方程为%dx^2+%dx+%d=0\n", a, b, c); t = b * b - 4 * a * c; if (t > 0) { f1(a, b, c); } if (t == 0) { f2(a, b, c); } if (t < 0) { f3(a, b, c); } return 0; } void f1(int a, int b, int c) { double x1, x2, t; t = b * b - 4 * a * c; x1 = (-b + sqrt(t)) / (2 * a); x2 = (-b - sqrt(t)) / (2 * a); printf("x1=%f,x2=%.2f", x1, x2); } void f2(int a, int b, int c) { double x1, x2, t; t = b * b - 4 * a * c; x1 = (-b + sqrt(t)) / (2 * a); x2 = x1; printf("x1=x2=%.2f", x1); } void f3(int a, int b, int c) { printf("无实根\n"); }