strlen inconsistency

Code:

#include <stdio.h>
#include <string.h>

int main(void)
{
	char *num = "73167176531330624919225119674426574742355349194934\
		96983520312774506326239578318016984801869478851843\
		85861560789112949495459501737958331952853208805511\
		12540698747158523863050715693290963295227443043557\
		66896648950445244523161731856403098711121722383113\
		62229893423380308135336276614282806444486645238749\
		30358907296290491560440772390713810515859307960866\
		70172427121883998797908792274921901699720888093776\
		65727333001053367881220235421809751254540594752243\
		52584907711670556013604839586446706324415722155397\
		53697817977846174064955149290862569321978468622482\
		83972241375657056057490261407972968652414535100474\
		82166370484403199890008895243450658541227588666881\
		16427171479924442928230863465674813919123162824586\
		17866458359124566529476545682848912883142607690042\
		24219022671055626321111109370544217506941658960408\
		07198403850962455444362981230987879927244284909188\
		84580156166097919133875499200524063689912560717606\
		05886116467109405077541002256983155200055935729725\
		71636269561882670428252483600823257530420752963450";
	
	printf("%i\n", strlen(num));
	


	return 0;
}

The output of this program is 1,038, which I don't understand considering the number is 1,000 digits long. Where did these extras come from?

All the white space at the start of each continued line.

If you want to fold long lines, then do it like this.

Code:

char *folded = "this is "
               "a folded line";

ANSI C specifies max. 509 chars in one string literal. Use the solution above and split your chars in more than one literals.

Originally Posted by BillyTKid

ANSI C specifies max. 509 chars in one string literal. Use the solution above and split your chars in more than one literals.

Yet, oddly enough he does have 1038 characters in a string literal...

It's the leading spaces that are tripping him up.

The latest C standard specifies:

5.2.4.1 Translation limits
The implementation shall be able to translate and execute at least one program that
contains at least one instance of every one of the following limits:14)

— 4095 characters in a logical source line
— 4095 characters in a character string literal or wide string literal (after concatenation)

Jim

Thanks Salem, that sorted it.