passing a pointer through a function c -

i'm trying exit while loop within function don't think i'm writing pointer correctly, c new me , reading examples online confusing.

i appreciate feed on i'm writing incorrectly.

int logon(int *log);  int main(void) {     int log;     log = 1;     while(log = 1)     {         int logon(log);     }      while(log = 2)     {         int mainmenu();     }      printf("\ngood bye"); }  int logon(*par) {     char p;      printf("would log on (y/n): ");     scanf("%s", &p);      if(p="y")     {         par = 2;     }     else if(p="n");     {         par = 3;     }     else     {         printf("\nerror entering command\n")     }     return 0; } 

i've updated code , fixed lot of errors guys helped identify.

now reason goes through logon loop twice if hit key neither 'y' or 'n'

this current code looks like

include

int logon(int *log); int mainmenu(int *log);  int main(void) {     int log;     log = 1;     while(log == 1)     {         (void) logon(&log);     }      while(log == 2)     {         mainmenu(&log);     }      printf("\ngood bye"); }  int logon(int *par) {     char p;      printf("would log on (y/n): ");     scanf("%c", &p);      if(p == 'y')     {         *par = 2;     }     else if(p == 'n')     {         *par = 3;     }     else     {         printf("\nerror entering command\n");     }     return 1; }  int mainmenu(int *par) {     printf("\nmain menu\n");     *par = 3;     return 0; } 

and out putting when dont hit 'y' or 'n'

 log on (y/n): e   error entering command  log on (y/n):   error entering command  log on (y/n):  

while(log = 1) while(log = 2) 

wrong. in c, = operator assignment, not comparison. setting log equal 1 , 2 there. want == operator comparison:

while(log == 1) 

next:

scanf("%s", &p); 

wrong. %s arrays of char ending in 0 ('\0'). how c represents strings. single character, want

scanf("%c", &p); 

next:

if(p="y") 

you misusing assignment operator again. in addition, comparing p, char "y", char * - char array. double quotes strings, single quotes/apostrophes single characters. looking for

if(p == 'y') 

next:

else if(p="n"); 

same errors above, plus, semicolon - ; doesn't belong there. suffice say, should cause compilation error on else statement below. want:

else if(p == 'n') 

next:

par = 2; par = 3; 

you assigning integers pointer. mean

*par = 2; *par = 3; 

next:

int logon(log); 

should be

(void) logon(&log); 

next:

int mainmenu(); 

i don't know mainmenu is, int keyword makes no sense there.