c - Given a string, store its substrings in a 2D array -

c - Given a string, store its substrings in a 2D array -

i asked write program, given string "acmprog", should generate , ordered set of substrings.

so here's code:

void gen_substrings(char a[],char sub[][100],int len){ int i,count=2; char first=a[0]; printf("%c",first); for(i=0;i<len-2;i++){ strncpy(sub[i],a,count); printf("%s\n",sub[i]); count++; } } main(){ char string[]={"acmprog"}; int len = sizeof(string); char substrings[len][100]; gen_substrings(string,substrings,len); system("pause"); }

when run it, output this:

when should be:

a ac acm acmp acmpr acmpro acmprog

what did wrong?

every time @ end of string have re-create null

for(i=0;i<len-2;i++) { strncpy(sub[j],a,count); //use different variable sub[j][count]='\0';// @ end , re-create null printf("%s\n",sub[j++]); count++; }

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