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