help wid c program 2 multiply 2 matrices....

[vinit suri]

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[QwertyManiac]

You missed using Ampersands while taking array inputs.

The below program is right and executes well for two 3x3 matrices filled with '3'. The output being a matrix with every element as 3 cubed (27).

#include<stdio.h>
int main()
{
int a[3][3],b[3][3],r[3][3],i,j,c,d,s;
i=0;
j=0;
c=0;
d=0;
s=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("enter 1 :");
scanf("%d",&a[i][j]);
}
}
i=0;
j=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{

printf("enter 2 :");
scanf("%d",&b[i][j]);
}
}
s=0;
for(c=0;c<3;c++)
{
for(d=0;d<3;d++)
{
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
s=s+(a[i][j]*b[j][i]);
}
r[c][d]=s;
s=0;
}
}

}
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("%d\t",r[i][j] );
}
printf("\n");
}

}

I haven't altered any logic, though I guess you sure can shorten the code a lot.

Check this thread too.