matrices with C

[easg]

I created this program that is supposed to read two 3x3 matrices and then sum and rest the values of the first matrix against the second and store the results y another two matrices, finally it has to print the resulting matrices, when I compile the program it doesn`t find any errors but the program does not promt for the value of the firt two matrices

# include
# include

void main (void)

{
int a,b;
int e[3][3];
int f[3][3];
int g[3][3];
int h[3][3];
clrscr();

printf ("\n Programa que suma y resta dos matrices");
printf ("\n Digite los datos");
for (a=1; a>=3; a++)
{
for (b=1; b>=3; b++)
{
printf ("\n e[%d][%d]= ",a,b);
scanf ("%d",&e[a][b]);
}
}
for (a=1; a>=3; a++)
{
for (b=1; b>=3; b++)
{
printf ("\n f[%d][%d]= ",a,b);
scanf ("%d",&f[a][b]);
}
}
for (a=1; a>=3; a++)
{
for (b=1; b>=3; b++)
g[a][b]=e[a][b]+f[a][b];
}
for (a=1; a>=3; a++)
{
for (b=1; a>=3; b++)
h[a][b]=e[a][b]-f[a][b];
}
printf ("\n La suma de las matrices es igual a: ");
for (a=1; a>=3; a++)
{
for (b=1; a>=3; b++)
printf ("\n g[%d][%d]",a,b);
}
printf ("\n La Resta de las matrices es igual a:");
for (a=1; a>=3; a++)
{
for (b=1; b>=3; b++)

printf ("\n h[%d][%d]",a,b);
}
getch ();
}

[alfie2]

for (a=1; a>=3; a++)
for (b=1; b>=3; b++)


All your "for loops" are wrongly written:

">=" means greater than or equal to

in your case
a>=3
or
b>=3
will create an infinite loop!
a and b will have 1 added to it infinitely!

you should have used

a<=3
or
b<=3
or
a<4
or
b<4

[easg]

That was the problem, sometimes the little things has the anwers, so I am not so lost in c programming, right?


# include
# include

void main (void)

{
int a,b;
int e[3][3];
int f[3][3];
int g[3][3];
int h[3][3];
clrscr();

printf ("\n Programa que suma y resta dos matrices");
printf ("\n Digite los datos");
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)
{
printf ("\n e[%d][%d]= ",a,b);
scanf ("%d",&e[a][b]);
}
}
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)
{
printf ("\n f[%d][%d]= ",a,b);
scanf ("%d",&f[a][b]);
}
}
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)
g[a][b]=e[a][b]+f[a][b];
}
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)
h[a][b]=e[a][b]-f[a][b];
}
printf ("\n La suma de las matrices es igual a: ");
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)
printf ("\n g[%d][%d], [%d] ",a,b,g[a][b]);
}
printf ("\n La Resta de las matrices es igual a:");
for (a=0; a<=2; a++)
{
for (b=0; b<=2; b++)

printf ("\n h[%d][%d], [%d]",a,b,h[a][b]);
}
getch ();
clrscr ();
}

[alfie2]

not so lost, at all.
I can pick this sorta things up because I am in the programming business for 20 odd years, doh, I gave up my age.
started programming with FORTRAN(when I was studying to be an electronic engineer), then PASCAL,C,Smalltalk...C++ so on; learning never stops, there is always something new.