How to merge to arrays in C language?

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

The logic to merge two arrays is given below −

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

Given below is the program which 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
");
   scanf("%d",&n);
   printf("Enter size of Array2
");
   scanf("%d",&m);
   o=m+n; //size of third array
   printf("Enter Elements of Array1
");
   for(i=0;i<n;i++){
      scanf("%d",&a[i]);
   }
   printf("Enter Elements of Array2
");
   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
");
   for(i=0;i<n;i++){
      printf("a[%d]=%d
",i,a[i]);
   }
   printf("Elements of Array2
");
   for(i=0;i<m;i++){
      printf("b[%d]=%d
",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 :
");
   for(i=0;i<o;i++){
      printf("c[%d]=%d
",i,c[i]);
   }
}

Output

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

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