How to merge two arrays in C language?

Taking two arrays as input, try to merge or concatenate the two arrays and store the result in the third array.

The logic of merging two arrays is as shown below- p>

J=0,k=0
for(i=0;i<o;i++) {// merging two arrays
   if(a[j]<=b[k]){
      c[i]=a[j];
      j++;
   } else {
      c[i]=b[k];
      k++;
   }
}

Program

The program given below shows how to merge two arrays in C programming language-

#include<stdio.h>
#include<stdlib.h>
int main(){
   int a[10],b[10],c[20],m,n,o,i,j,k,temp;
   printf("Enter size of Array1</p><p>");
   scanf("%d",&n);
   printf("Enter size of Array2</p><p>");
   scanf("%d",&m);
   o=m+n; //size of third array
   printf("Enter Elements of Array1</p><p>");
   for(i=0;i<n;i++){
      scanf("%d",&a[i]);
   }
   printf("Enter Elements of Array2</p><p>");
   for(i=0;i<m;i++){
      scanf("%d",&b[i]);
   }
   //sorting first array
   for(i=0;i<n;i++){
      for(j=0;j<n-1-i;j++){
         if(a[j]>a[j+1]){
            temp=a[j];
            a[j]=a[j+1];
            a[j+1]=temp;
         }
      }
   }
   //sorting second array
   for(i=0;i<m;i++){
      for(j=0;j<m-1-i;j++){
         if(b[j]>b[j+1]){
            temp=b[j];
            b[j]=b[j+1];
            b[j+1]=temp;
         }
      }
   }
   printf("Elements of Array1</p><p>");
   for(i=0;i<n;i++){
      printf("a[%d]=%d</p><p>",i,a[i]);
   }
   printf("Elements of Array2</p><p>");
   for(i=0;i<m;i++){
      printf("b[%d]=%d</p><p>",i,b[i]);
   }
   j=0;
   k=0;
   for(i=0;i<o;i++){ // merging two arrays
      if(a[j]<=b[k]){
         c[i]=a[j];
         j++;
      }
      else{
         c[i]=b[k];
         k++;
      }
   }
   printf("Merged array is :</p><p>");
   for(i=0;i<o;i++){
      printf("c[%d]=%d</p><p>",i,c[i]);
   }
}

Output

When the above program is executed, it produces the following results −

Enter Elements of Array1
1
2
3
4
Enter Elements of Array2
6
8
3
Elements of Array1
a[0]=1
a[1]=2
a[2]=3
a[3]=4
Elements of Array2
b[0]=3
b[1]=6
b[2]=8
Merged array is:
c[0]=1
c[1]=2
c[2]=3
c[3]=3
c[4]=4
c[5]=6
c[6]=8

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