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发表于 2016-11-15 23:21:25
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- #include <stdio.h>
- #include <math.h>
- int main()
- {
- printf("一元二次方程\n");
- int x2_x, x1_x, c, z;
- #if(0)
- printf("请输入方程(例如1x^2+2x+1=0):");
- scanf("%dx^2+%dx+%d=%d", &x2_x, &x1_x, &c, &z);
- #else
- printf("请输入方程的二次项系数、一次项系数、常数项、值(例如方程1x^2-1x-2=0,应输入1,-1,-2,0):");
- scanf("%d,%d,%d,%d", &x2_x, &x1_x, &c, &z);
- #endif
- double x2_x_n = x2_x, x1_x_n = x1_x, c_n = c, z_n = z;
- c_n += -z_n;
- if(x1_x_n * x1_x_n - 4 * x2_x_n * c_n >= 0)
- {
- double j1, j2;
- j1 = (-x1_x_n + sqrt(x1_x_n * x1_x_n - 4 * x2_x_n * c_n)) / 2 * x2_x_n;
- j2 = (-x1_x_n - sqrt(x1_x_n * x1_x_n - 4 * x2_x_n * c_n)) / 2 * x2_x_n;
- printf("x1=%.0f, x2=%.0f\n", j1, j2);
- }
- else
- {
- printf("No answer\n");
- }
-
- return 0;
- }
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