90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
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#include <stdio.h>
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#include <math.h>
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double (*primary[7])(double);
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char *secondary[] = { "sin(x)", "cos(x)", "ceil(x)", "floor(x)", "fabs(x)", "log(x)", "sqrt(x)" };
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void process_choice();
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void map_function_pointers(double (**arr)(double), int pos, int n) {
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switch (n) {
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case 0:
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arr[pos] = sin;
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break;
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case 1:
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arr[pos] = cos;
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break;
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case 2:
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arr[pos] = ceil;
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break;
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case 3:
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arr[pos] = floor;
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break;
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case 4:
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arr[pos] = fabs;
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break;
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case 5:
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arr[pos] = log;
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break;
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case 6:
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arr[pos] = sqrt;
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break;
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default:
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fprintf(stderr, "Error\n");
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}
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}
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void clean_stdin() {
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int c; while ( (c = getchar()) != '\n' );
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}
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void display_menu() {
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for (int i = 0; i < 7; i++) {
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printf("%d. %s\n", i, secondary[i]);
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}
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}
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void init() {
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for (int i = 0; i < 7; i++) {
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map_function_pointers(primary, i, i);
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}
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}
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int is_valid(int flag) {
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if (!flag) {
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fprintf(stderr, "Invalid choice!\n");
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clean_stdin();
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return 0;
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}
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return 1;
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}
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void process_choice() {
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display_menu();
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int choice = -1;
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double value = 0;
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printf("Choice: ");
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int flag = scanf("%d", &choice);
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if ( !is_valid(flag) ) { return process_choice(); }
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if (choice < 0 || choice > 6) {
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fprintf(stderr, "Out of range choice!\n");
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return process_choice();
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}
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printf("Enter a value: ");
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int value_flag = scanf("%lf", &value);
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if ( !is_valid(value_flag) ) {
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fprintf(stderr, "Invalid value!\n");
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return process_choice();
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}
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printf("RESULT: %f\n", primary[choice](value));
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}
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int main() {
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init();
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process_choice();
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return 0;
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}
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