c++ - what does this loop means: for(j,0,np) - 


inline string search_prod(string p) //returns concatenated string of variables can produce string p     {         int j,k;         string r="";         for(j,0,np)         {             k=1;             while(gram[j][k] != "")             {                 if(gram[j][k] == p)                 {                     r=concat(r,gram[j][0]);                 }                 k++;             }         }            return r;     }

i have never seen loop before.

okay. @ashishjohn question solvable.

in provided link can see define in beginning changes syntax of loops:

#define for(i,a,b) for(i=a;i<b; i++)

so for(j,0,np) converted preprocessor to:

for (j=0; j<np; j++)

which normal loop. np declared in file , nothing global integer variable.

however, @molbdnilo pointed out correctly standard (n4296) forbids declaration of macros override existing keywords:

17.6.4.3.1 macro names

  1. a translation unit includes standard library header shall not #define or #undef names declared in standard library header.

  2. a translation unit shall not #define or #undef names lexically identical keywords, identifiers listed in table 2, or attribute-tokens described in 7.6

therefore may or may not behave described it.


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