# Input numbers in 2d array and swap the largest with the smallest number in C

###### Two Dimensional Array - Question 4

In this question, we will see how to input numbers in a 3X3 integer matrix (2d array) and interchange the largest with the smallest number from it in C programming. To know more about two dimensional array click on the two dimensional array lesson.

**Q4)** Write a program in C to input numbers in a 3X3 integer matrix (2d array) and interchange the largest with the smallest number from it.

#### Program

```
#include <stdio.h>
#include <conio.h>
int main()
{
int a[3][3], r,c,lg=0,lr,lc,sm=0,sr,sc;
printf("Enter 9 numbers\n");
for(r=0; r<3; r++)
{
for(c=0; c<3; c++)
{
scanf("%d",&a[r][c]);
if(r==0 && c==0)
{
lg=a[r][c];
lr=r;
lc=c;
sm=a[r][c];
sr=r;
sc=c;
}
else if(a[r][c]>lg)
{
lg=a[r][c];
lr=r;
lc=c;
}
else if(a[r][c]<sm)
{
sm=a[r][c];
sr=r;
sc=c;
}
}
}
a[lr][lc]=sm;
a[sr][sc]=lg;
printf("\nArray after interchanging largest with the smallest number\n");
for(r=0; r<3; r++)
{
for(c=0; c<3; c++)
{
printf("%d ",a[r][c]);
}
printf("\n");
}
return 0;
}
```

#### Output

Enter 9 numbers 5 12 18 2 17 23 45 96 62 Array after interchanging largest with the smallest number 5 12 18 96 17 23 45 2 62