/* * File: findcoin.c * ---------------- * This program uses a search operation to report the names of * legal U.S. coins. */#include <stdio.h>#include <ctype.h>#include "simpio.h"#include "genlib.h"/* * Global variables * ---------------- * coinNames  -- Array containing the name of each coin * coinValues -- Array containing the corresponding coin values * nCoins     -- Number of distinct coins */static string coinNames[] = {    "penny",    "nickel",    "dime",    "quarter",    "half-dollar",};static int coinValues[] = { 1, 5, 10, 25, 50 };static int nCoins = sizeof coinValues / sizeof coinValues[0];/* Private function declarations */static int FindIntegerInArray(int key, int array[], int n);/* Main program */main(){    int value, index;    printf("This program looks up names of U.S. coins.\n");    printf("Enter coin value: ");    value = GetInteger();    index = FindIntegerInArray(value, coinValues, nCoins);    if (index == -1) {        printf("There is no such coin.\n");    } else {        printf("That's called a %s.\n", coinNames[index]);    }}/* * Function: FindIntegerInArray * Usage: index = FindIntegerInArray(key, array, n); * ----------------------------------------------- * This function returns the index of the first element in the * specified array of integers that matches the value key.  If * key does not appear in the first n elements of the array, * FindIntegerInArray returns -1. */static int FindIntegerInArray(int key, int array[], int n){    int i;    for (i = 0; i < n; i++) {        if (key == array[i]) return (i);    }    return (-1);}