Write a program to fill a square matrix with value zero on the diagonals 1 on the upper right triangle and –1 on the lower left triangle

#include <stdio.h>
#include <conio.h>
void read_matrix(int mat[5][5], int);
void display_matrix(int mat[5][5], int);
int main()
{
int row;
int mat1[5][5];
clrscr();
printf("\n Enter the number of rows and columns of the matrix:");
scanf("%d", &row);
read_matrix(mat1, row);
display_matrix(mat1, row);
getch();
return 0;
}
void read_matrix(int mat[5][5], int r)
{
int i, j;
for(i=0; i<r; i++)
{
for(j=0; j<r; j++)
{
if(i==j)
mat[i][j] = 0;
else if(i>j)
mat[i][j] = –1;
else
mat[i][j] = 1;
}
}
}
void display_matrix(int mat[5][5], int r)
{
int i, j;
for(i=0; i<r; i++)
{
printf("\n");
for(j=0; j<r; j++)
printf("\t %d", mat[i][j]);
}
}