cannot declare an array in c with a variable value
I am trying to create a program to generate magic square by a given value of n in C language.
here is the code
#include<stdio.h>
#include<string.h>
// A function to generate odd sized magic squares
void generateSquare(int n)
{
int magicSquare[n][n];
// set all slots as 0
memset(magicSquare, 0, sizeof(magicSquare));
// Initialize position for 1
int i = n/2;
int j = n-1;
// One by one put all values in magic square
for (int num=1; num <= n*n; )
{
if (i==-1 && j==n) //3rd condition
{
j = n-2;
i = 0;
}
else
{
// 1st condition helper if next number
// goes to out of square's right side
if (j == n)
j = 0;
// 1st condition helper if next number
// is goes to out of square's upper side
if (i < 0)
i=n-1;
}
if (magicSquare[i][j]) //2nd condition
{
j -= 2;
i++;
continue;
}
else
magicSquare[i][j] = num++; //set number
j++; i--; //1st condition
}
// Print magic square
printf("The Magic Square for n=%d:nSum of "
"each row or column %d:nn", n, n*(n*n+1)/2);
for (i=0; i<n; i++)
{
for (j=0; j<n; j++)
printf("%3d ", magicSquare[i][j]);
printf("n");
}
}
// Driver program to test above function
int main()
{
int n = 7; // Works only when n is odd
generateSquare (n);
return 0;
}
while compiling the program in turbo c compiler i get the following errors
line 7 constant expression required
line 13 declaration not allowed here
line 14 declaration not allowed here
undefined symbol num
the program works well if i run it as a c++ file but it shows errors as a c program
c
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
add a comment |
I am trying to create a program to generate magic square by a given value of n in C language.
here is the code
#include<stdio.h>
#include<string.h>
// A function to generate odd sized magic squares
void generateSquare(int n)
{
int magicSquare[n][n];
// set all slots as 0
memset(magicSquare, 0, sizeof(magicSquare));
// Initialize position for 1
int i = n/2;
int j = n-1;
// One by one put all values in magic square
for (int num=1; num <= n*n; )
{
if (i==-1 && j==n) //3rd condition
{
j = n-2;
i = 0;
}
else
{
// 1st condition helper if next number
// goes to out of square's right side
if (j == n)
j = 0;
// 1st condition helper if next number
// is goes to out of square's upper side
if (i < 0)
i=n-1;
}
if (magicSquare[i][j]) //2nd condition
{
j -= 2;
i++;
continue;
}
else
magicSquare[i][j] = num++; //set number
j++; i--; //1st condition
}
// Print magic square
printf("The Magic Square for n=%d:nSum of "
"each row or column %d:nn", n, n*(n*n+1)/2);
for (i=0; i<n; i++)
{
for (j=0; j<n; j++)
printf("%3d ", magicSquare[i][j]);
printf("n");
}
}
// Driver program to test above function
int main()
{
int n = 7; // Works only when n is odd
generateSquare (n);
return 0;
}
while compiling the program in turbo c compiler i get the following errors
line 7 constant expression required
line 13 declaration not allowed here
line 14 declaration not allowed here
undefined symbol num
the program works well if i run it as a c++ file but it shows errors as a c program
c
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
4
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
2
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24
add a comment |
I am trying to create a program to generate magic square by a given value of n in C language.
here is the code
#include<stdio.h>
#include<string.h>
// A function to generate odd sized magic squares
void generateSquare(int n)
{
int magicSquare[n][n];
// set all slots as 0
memset(magicSquare, 0, sizeof(magicSquare));
// Initialize position for 1
int i = n/2;
int j = n-1;
// One by one put all values in magic square
for (int num=1; num <= n*n; )
{
if (i==-1 && j==n) //3rd condition
{
j = n-2;
i = 0;
}
else
{
// 1st condition helper if next number
// goes to out of square's right side
if (j == n)
j = 0;
// 1st condition helper if next number
// is goes to out of square's upper side
if (i < 0)
i=n-1;
}
if (magicSquare[i][j]) //2nd condition
{
j -= 2;
i++;
continue;
}
else
magicSquare[i][j] = num++; //set number
j++; i--; //1st condition
}
// Print magic square
printf("The Magic Square for n=%d:nSum of "
"each row or column %d:nn", n, n*(n*n+1)/2);
for (i=0; i<n; i++)
{
for (j=0; j<n; j++)
printf("%3d ", magicSquare[i][j]);
printf("n");
}
}
// Driver program to test above function
int main()
{
int n = 7; // Works only when n is odd
generateSquare (n);
return 0;
}
while compiling the program in turbo c compiler i get the following errors
line 7 constant expression required
line 13 declaration not allowed here
line 14 declaration not allowed here
undefined symbol num
the program works well if i run it as a c++ file but it shows errors as a c program
c
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
I am trying to create a program to generate magic square by a given value of n in C language.
here is the code
#include<stdio.h>
#include<string.h>
// A function to generate odd sized magic squares
void generateSquare(int n)
{
int magicSquare[n][n];
// set all slots as 0
memset(magicSquare, 0, sizeof(magicSquare));
// Initialize position for 1
int i = n/2;
int j = n-1;
// One by one put all values in magic square
for (int num=1; num <= n*n; )
{
if (i==-1 && j==n) //3rd condition
{
j = n-2;
i = 0;
}
else
{
// 1st condition helper if next number
// goes to out of square's right side
if (j == n)
j = 0;
// 1st condition helper if next number
// is goes to out of square's upper side
if (i < 0)
i=n-1;
}
if (magicSquare[i][j]) //2nd condition
{
j -= 2;
i++;
continue;
}
else
magicSquare[i][j] = num++; //set number
j++; i--; //1st condition
}
// Print magic square
printf("The Magic Square for n=%d:nSum of "
"each row or column %d:nn", n, n*(n*n+1)/2);
for (i=0; i<n; i++)
{
for (j=0; j<n; j++)
printf("%3d ", magicSquare[i][j]);
printf("n");
}
}
// Driver program to test above function
int main()
{
int n = 7; // Works only when n is odd
generateSquare (n);
return 0;
}
while compiling the program in turbo c compiler i get the following errors
line 7 constant expression required
line 13 declaration not allowed here
line 14 declaration not allowed here
undefined symbol num
the program works well if i run it as a c++ file but it shows errors as a c program
c
c
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
edited Nov 13 '18 at 17:42
Pete Becker
57.6k440117
57.6k440117
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
asked Nov 13 '18 at 16:19
NotNitinNotNitin
61
61
4
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
2
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24
add a comment |
4
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
2
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24
4
4
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
2
2
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24
add a comment |
1 Answer
1
active
oldest
votes
You are probably using TurboC.
TurboC uses an outdated compiler of C language. It supports Borland Compiler . It was preferable when windows Xp was in trend. It has now become obsolete.
Use latest gcc or g++ instead.
You may shift to Ubuntu or Mac
or can try CodeBlocks for Windows.
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You are probably using TurboC.
TurboC uses an outdated compiler of C language. It supports Borland Compiler . It was preferable when windows Xp was in trend. It has now become obsolete.
Use latest gcc or g++ instead.
You may shift to Ubuntu or Mac
or can try CodeBlocks for Windows.
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
add a comment |
You are probably using TurboC.
TurboC uses an outdated compiler of C language. It supports Borland Compiler . It was preferable when windows Xp was in trend. It has now become obsolete.
Use latest gcc or g++ instead.
You may shift to Ubuntu or Mac
or can try CodeBlocks for Windows.
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
add a comment |
You are probably using TurboC.
TurboC uses an outdated compiler of C language. It supports Borland Compiler . It was preferable when windows Xp was in trend. It has now become obsolete.
Use latest gcc or g++ instead.
You may shift to Ubuntu or Mac
or can try CodeBlocks for Windows.
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
You are probably using TurboC.
TurboC uses an outdated compiler of C language. It supports Borland Compiler . It was preferable when windows Xp was in trend. It has now become obsolete.
Use latest gcc or g++ instead.
You may shift to Ubuntu or Mac
or can try CodeBlocks for Windows.
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
answered Nov 13 '18 at 17:57
Sahil SinghSahil Singh
286
286
add a comment |
add a comment |
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4
You need a C compiler that supports C99. Turbo C is way too old.
– Paul R
Nov 13 '18 at 16:24
2
VLAs were introduced in C99. Your compiler is probably too old to support that language standard.
– Swordfish
Nov 13 '18 at 16:24