Compilare: user.c: In function ‘main’: user.c:35:13: warning: implicit declaration of function ‘kombinacio’ [-Wimplicit-function-declaration] kombinacio(C,t,length,j,0,n,k,talalt,0); ^ user.c: At top level: user.c:46:6: warning: conflicting types for ‘kombinacio’ [enabled by default] void kombinacio(char *C,int *t, int length, int j, int szint, int n,int k,int *talalt,int honnan) { ^ user.c:35:13: note: previous implicit declaration of ‘kombinacio’ was here kombinacio(C,t,length,j,0,n,k,talalt,0); ^ user.c: In function ‘kombinacio’: user.c:52:9: warning: implicit declaration of function ‘sum’ [-Wimplicit-function-declaration] if(sum(C,t,j)%n == k) talalt[0]++; ^ user.c:57:9: warning: implicit declaration of function ‘megfelel’ [-Wimplicit-function-declaration] if(megfelel(t,szint)) kombinacio(C,t,length,j,szint+1,n,k,talalt,t[szint]+1); ^ user.c: In function ‘main’: user.c:12:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%i", &s); ^ user.c:18:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%i%i", &n, &k); ^ user.c:20:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%c", &c); ^ user.c:24:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%c", &c); ^