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接前面的代碼
- #include <stdio.h>
- #include <math.h>
- #include <stdbool.h>
- float Res_cal(float a, float b, float c, float d);
- float Res_cal2(float a, float b, float c);
- int float_equal(float x, float y, float epsilon);
- void screen1(float res);
- void screen2(float res);
- float arr1[32] = {0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.3, 4, 5, 6, 8, 10, 12, 15, 20, 22, 25, 30, 33, 39, 47, 50, 68, 75, 100, 120, 150, 200, 300, 330, 500};
- void main() {
- float res, mistake;
- int num, flag;
- //printf("%f\n", arr1[0]);
- flag = 0;
- while (true) {
- printf("請(qǐng)輸入需要計(jì)算的阻值(范圍0.1-100)：");
- scanf("%f", &res);
- printf("請(qǐng)輸入并聯(lián)電阻個(gè)數(shù)(3或者4)：");
- scanf("%d", &num);
- for (int i = 0; i < 32; i++) {
- if (float_equal(res, arr1[i], 0.0001)) {
- printf("arr1[%d]:%g\r\n", i, arr1[i]);
- flag = 1;
- break;
- }
- }
- if ( !flag) {
- if (3 == num)
- screen1(res);
- else
- screen2(res);
- }
- flag = 0;
- printf("***********************************************************\r\n");
- }
- }
- float Res_cal(float a, float b, float c, float d) {
- float result;
- result = 1 / (1 / a + 1 / b + 1 / c + 1 / d);
- return result;
- }
- float Res_cal2(float a, float b, float c) {
- float result;
- result = 1 / (1 / a + 1 / b + 1 / c );
- return result;
- }
- int float_equal(float x, float y, float epsilon) {
- if (fabs(x - y) < epsilon)
- return 1;
- else
- return 0;
- }
- void screen2(float res) {
- int arr[4];
- float result, flag = 1;
- for (int i = 0; i < 32; i++) {
- for (int j = i; j < 32; j++) {
- for (int k = i; k < 32; k++) {
- for (int l = i; l < 32; l++) {
- if (flag > fabs(Res_cal(arr1[i], arr1[j], arr1[k], arr1[l]) - res)) {
- flag = fabs(Res_cal(arr1[i], arr1[j], arr1[k], arr1[l]) - res);
- result = Res_cal(arr1[i], arr1[j], arr1[k], arr1[l]);
- arr[0] = i;
- arr[1] = j;
- arr[2] = k;
- arr[3] = l;
- }
- }
- }
- }
- }
- printf("arr1[%d]:%g arr1[%d]:%g arr1[%d]:%g arr1[%d]:%g 阻值：%g\r\n", arr[0], arr1[arr[0]], arr[1], arr1[arr[1]],
- arr[2],
- arr1[arr[2]], arr[3], arr1[arr[3]], result);
- }
- void screen1(float res) {
- int arr[3];
- float result, flag = 1;
- for (int i = 0; i < 32; i++) {
- for (int j = i; j < 32; j++) {
- for (int k = i; k < 32; k++) {
- if (flag > fabs(Res_cal2(arr1[i], arr1[j], arr1[k]) - res)) {
- flag = fabs(Res_cal2(arr1[i], arr1[j], arr1[k]) - res);
- result = Res_cal2(arr1[i], arr1[j], arr1[k]);
- arr[0] = i;
- arr[1] = j;
- arr[2] = k;
- }
- }
- }
- }
- printf("arr1[%d]:%g arr1[%d]:%g arr1[%d]:%g 阻值：%g\r\n", arr[0], arr1[arr[0]], arr[1], arr1[arr[1]], arr[2],
- arr1[arr[2]], result);
- }
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