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C program to compare two arrays.

In this program we will learn how to compare two one dimensional arrays in c programming language?

In this program we will read two one dimensional arrays of 5 elements and compare them.

Here are the functions which we designed to read, print and compare arrays

• readArray()
• printArray()
• compareArray()

readArray() will read array of 5 elements.

printArray() will print array of 5 elements.

compareArray() will compare elements of both of the array elements and returns 0 if all elements are equal otherwise function will return 1.

C program (Code Snippet) - Compare Two Arrays

Let’s consider the following example:

/*c program to compare two arrays*/

#include <stdio.h>

//function to read array elements
void readArray(int arr[], int size) 
{ 
    int i =0; 
 
    printf("\nEnter elements : \n"); 
 
    for(i=0; i < size; i++) 
    { 
        printf("Enter arr[%d] : ",i); 
        scanf("%d",&arr[i]); 
    } 
} 

//print array elements
void printArray(int arr[],int size) 
{ 
    int i =0; 
 
    printf("\nElements are : "); 
 
    for(i=0; i < size; i++) 
    { 
        printf("\n\tarr[%d] : %d",i,arr[i]); 
    } 
    printf("\n"); 
} 

//function to compare array elements
char compareArray(int a[],int b[],int size)	{
	int i;
	for(i=0;i<size;i++){
		if(a[i]!=b[i])
			return 1;
	}
	return 0;
}

int main(){
	int a[5],b[5];
	readArray(a,5);
	readArray(b,5);
	
	if(compareArray(a,b,5)==0){
		printf("Arrays have same elements.\n");
		printArray(a,5);
	}
	else{
		printf("Arrays have different elements.\n");
	}
		
	return 0;
}

Output

    First Run:
    Enter elements :
    Enter arr[0] : 10 
    Enter arr[1] : 20 
    Enter arr[2] : 30 
    Enter arr[3] : 40 
    Enter arr[4] : 50 

    Enter elements :
    Enter arr[0] : 10 
    Enter arr[1] : 20 
    Enter arr[2] : 30 
    Enter arr[3] : 40 
    Enter arr[4] : 50 
    Arrays have same elements.

    Elements are :
	    arr[0] : 10 
	    arr[1] : 20 
	    arr[2] : 30 
	    arr[3] : 40 
	    arr[4] : 50 

    Second Run:	
    Enter elements :
    Enter arr[0] : 10 
    Enter arr[1] : 20 
    Enter arr[2] : 30 
    Enter arr[3] : 40 
    Enter arr[4] : 50 

    Enter elements :
    Enter arr[0] : 10 
    Enter arr[1] : 20 
    Enter arr[2] : 40 
    Enter arr[3] : 40 
    Enter arr[4] : 40
    Arrays have different  elements.