Here is the simple C program to insert an element in a one dimensional array. The array should be in ascending order. #include<stdio.h> int main() { int a[20],n,x,i,pos=0; printf(“Enter size of array:”); scanf(“%d”,&n); printf(“Enter the array in ascending order:\n”); for(i=0;i<n;++i) scanf(“%d”,&a[i]); printf(“\nEnter element to insert:”); scanf(“%d”,&x); for(i=0;i<n;++i) if(a[i]<=x&&x<a[i+1]) { pos=i+1; break; } for(i=n+1;i>pos;–i) a[i]=a[i-1]; a[pos]=x;

Here is the simple C program to find sum of elements above and below main diagonal of matrix. The matrix should be square matrix. #include<stdio.h> int main() { int i,j,m,n,d1=0,d2=0,a[5][5]; printf(“How many rows and columns:”); scanf(“%d%d”,&m,&n); printf(“Enter matrix elements:\n”); for(i=0;i<m;++i) for(j=0;j<n;++j) { scanf(“%d”,&a[i][j]); if(j>i) d1+=a[i][j]; else if(i>j) d2+=a[i][j]; } printf(\n”Sum of elements above the diagonal=%d\n”,d1);