Array - Main & Secondary Diagonal, Upper & Lower Triangle

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 //PROGRAM TP PRINT MAIN DIAGONAL, OFF DIAGONAL, THEIR SUM, UPPER & LOWER RIANGLE 
//Downloaded from www.c4cprog.co.nr 
#include<conio.h> 
void diag(int a[][100],int r,int c) 
{ 
int i,j,sum=0,op; 
printf("\n\n1.Main Diagonal\n2.Off Diagonal :"); 
scanf("%d",&op); 
if(op==1) 
{ 
printf("\n\n"); 
printf("\n\nMain Diagonal"); 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
{ 
printf("\t"); 
if(i==j) 
{ 
printf("%d",a[i][j]); 
sum=sum+a[i][j]; 
}}} 
printf("\n\nSum : %d",sum); 
} 
if(op==2) 
{ 
printf("\n\n"); 
printf("\n\nOff Diagonal"); 
sum=0; 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
{ 
printf("\t"); 
if(i+j==(r-1)) 
{ 
printf("%d",a[i][j]); 
sum=sum+a[i][j]; 
}}} 
printf("\n\nSum : %d",sum); 
} 
if(i>2) 
printf("\n\nWrong Choice !!"); 
} 
void tria(int a[][100],int r,int c) 
{ 
int i,j,op; 
printf("\n\n1.Upper Triangle\n2.Lower Triangle :"); 
scanf("%d",&op); 
if(op==2) 
{ 
printf("\n\nLower Triangle :"); 
printf("\n\n"); 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
{ 
printf("\t"); 
if(i>=j) 
printf("%d",a[i][j]); 
}} 
} 
if(op==1) 
{ 
printf("Upper Triangle"); 
printf("\n\n"); 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
{ 
printf("\t"); 
if(i<=j) 
printf("%d",a[i][j]); 
}}} 
if(i>2) 
printf("\n\nWrong Choice !!"); 
} 
void main() 
{ 
int r,c,a[100][100],i,j,op; 
char v; 
clrscr(); 
do{ 
printf("\nEnter Array Row Limit :"); 
scanf("%d",&r); 
printf("\nEnter Array Column Limit :"); 
scanf("%d",&c); 
if(r==c) 
{ 
printf("\nEnter Array :\n"); 
for(i=0;i<r;i++) 
for(j=0;j<c;j++) 
scanf("%d",&a[i][j]); 
printf("\n\nOptions :\n\n1.Diagonal & Sum\n2.Triangle\n\nEnter :"); 
scanf("%d",&op); 
switch(op) 
{ 
case 1: 
diag(a,r,c); 
break; 
case 2: 
tria(a,r,c); 
break; 
default : 
printf("\n\nWrong Choice"); 
} 
} 
else 
printf("\n\nNo. Of Rows Not Equal To No. Of Columns !!!"); 
printf("\n\nPress 'e' To EXIT & Any Other Key To Continue :"); 
scanf(" %c",&v); 
}while(v!='e'); 
}