Question

Write a C program that uses the random number generator rand( ) to create an array with 20 numbers with value in the range from 1 to 100. The program calculates and displays the difference between the largest array element and the second largest array element in the array.

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
   int seedVal = 0, i, max, nextMax;
   int a[20] = {0};
   srand(time((time_t*)&seedVal));
    printf("Random array:\n");
    for(i = 0;i<20;i++){
       a[i] = 1+rand()%100;
       printf("%d ",a[i]);
   }
   printf("\n");
   max = a[0];
    nextMax = max;
    for(i = 0;i<20;i++){
        if(a[i]>max){
            if(nextMax<max){
                nextMax = max;
            }
            max = a[i];
        }
        else if(a[i]>nextMax){
            nextMax = a[i];
        }
    }
    printf("Largest element = %d\n",max);
    printf("Second largest element = %d\n",nextMax);
   printf("Difference between the largest array element and the second largest array element in the array =  %d\n",max-nextMax);
   return 0;
}

$\color{blue}\underline{Output:}$

Random array: 44 45 13 32 40 31 92 12 56 4 74 83 2 68 7 43 87 66 2 64 Largest element = 92 Second largest element = 87 Difference between the largest array element and the second largest array element in the array = 5

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