Arithmetic Operations On Array

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 //ARRAY ADDITION, SUBTRACTION & MULTIPLICATION 
//Downloaded from www.c4cprog.co.nr 
#include<conio.h> 
void add(int a[][100],int b[][100],int r,int c) 
{ 
int i,j,s[100][100]; 
for(i=0;i<r;i++) 
for(j=0;j<c;j++) 
s[i][j]=a[i][j]+b[i][j]; 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
printf("\t%d",s[i][j]); 
} 
} 
void sub(int a[][100],int b[][100],int r,int c) 
{ 
int i,j,s[100][100]; 
for(i=0;i<r;i++) 
for(j=0;j<c;j++) 
s[i][j]=a[i][j]-b[i][j]; 
for(i=0;i<r;i++) 
{ 
printf("\n"); 
for(j=0;j<c;j++) 
printf("\t%d",s[i][j]); 
} 
} 
void mult() 
{ 
int i,j,s[100][100],a[100][100],b[100][100],sum,k,r1,r2,c1,c2; 
clrscr(); 
printf("\nEnter Array 1 Row Limit :"); 
scanf("%d",&r1); 
printf("\nEnter Array 1 Column Limit :"); 
scanf("%d",&c1); 
printf("\nEnter Array 1 :\n"); 
for(i=0;i<r1;i++) 
for(j=0;j<c1;j++) 
scanf("%d",&a[i][j]); 
printf("\nEnter Array 2 Row Limit :"); 
scanf("%d",&r2); 
printf("\nEnter Array 2 Column Limit :"); 
scanf("%d",&c2); 
printf("\nEnter Array 2 :\n"); 
for(i=0;i<r2;i++) 
for(j=0;j<c2;j++) 
scanf("%d",&b[i][j]); 
if(c1!=r2) 
printf("\n\nMultiplication is NOT POSSIBLE !"); 
else 
{ 
for(i=0;i<r1;i++) 
for(j=0;j<c2;j++) 
{ 
sum=0; 
for(k=0;k<r2;k++) 
sum=sum+a[i][k]*b[k][j]; 
s[i][j]=sum; 
} 
for(i=0;i<r1;i++) 
{ 
printf("\n"); 
for(j=0;j<c2;j++) 
printf("\t%d",s[i][j]); 
}} 
} 
void main() 
{ 
int r,c,i,j,a[100][100],b[100][100],op; 
char v; 
do{ 
clrscr(); 
printf("\nEnter Array Row Limit :"); 
scanf("%d",&r); 
printf("\nEnter Array Column Limit :"); 
scanf("%d",&c); 
printf("\n\nEnter Array A :\n"); 
for(i=0;i<r;i++) 
for(j=0;j<c;j++) 
scanf("%d",&a[i][j]); 
printf("\n\nEnter Array B :\n"); 
for(i=0;i<r;i++) 
for(j=0;j<c;j++) 
scanf("%d",&b[i][j]); 
printf("\n\nOptions :\n\n1.Addition\n2.Subtraction\n3.Multiplication\n\nEnter Choice :"); 
scanf("%d",&op); 
switch(op) 
{ 
case 1: 
add(a,b,r,c); 
break; 
case 2: 
sub(a,b,r,c); 
break; 
case 3: 
mult(); 
break; 
default: 
printf("\n\nWrong Choice !!!"); 
} 
printf("\n\nPress 'e' To EXIT Or Any Other Key To Conitnue :"); 
scanf(" %c",&v); 
}while(v!='e'); 
}