Question

I’m trying to solve the 8th problem of the project Euler and I’m stuck because I can’t manage to create a very long array of char.

There must be a stupid semantic issue, but I’m unable to find it.

   char cifre[] = "very long list of numbers here";

Answer 1

Such example works with gcc:

#include <stdio.h>

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

    printf ("%s",x);
}

It prints your long number on screen without any problem. Symbol \ in string tells compiler that string literal is continued on next line. You are free to modify this example as you want. But please note that modifying content of string pointed by x isn’t good idea.