fork() and exec() functions in C -

so writing program repeatedly reads lines of input standard input, splits them in char **array. each line, treat first element full path program executed. execute program, passing rest of items on line arguments. if line empty, nothing , go next line. repeat until first element string ”exit”.

my problems are:

1. when input "exit", strcmp(l[0], "exit") returns 10 instead of 0. why?
2. the program got compiled works odd number of arguments. example, if input "/bin/echo good", prints "this good" if input "/bin/echo good", prints "error".

here code:

#include <stdio.h> #include <string.h> #include <stdlib.h> #define bufsize 10000 int space; char** createarray(char *line) {     int len_line = strlen(line);     char **wordarray = null;         if(len_line > 1){                char *token = strtok(line, " ");             space = 0;         while (token) {             wordarray = realloc(wordarray, sizeof(char*)*++space);             wordarray[space-1] = token;             token = strtok(null, " ");         }     }     return wordarray; }   int main(int argc, const char* argv[]) {         char line[bufsize];     while (1) {          printf("%s\n", ">");         fgets(line, bufsize, stdin);         char** l = createarray(line);          if (l) {             /*why instaed of zero, when l[0]              /*equals quit, strcmp() returns 10?*/                printf("%d\n", strcmp(l[0], "exit"));                    if(strcmp(l[0], "exit")==10) {                 exit(0);             }             else if(fork() == 0) {                 execv(l[0], l);                 printf("%s\n", "error!");             }         }     }     return 1; }  

coming first issue facing

1. when input "exit", strcmp(l[0], "exit") returns 10 instead of 0. why? 

when type "exit" , press enter key, string read fgets "exit\n". comparing "exit" "exit\n" gives 10. either remove "\n" end before comparing or change comparison method

if(strcmp(l[0], "exit\n") == 0) 

see corrected code below

int main(int argc, const char* argv[]) {     char line[bufsize];     while (1) {         printf("%s\n", ">");         fgets(line, bufsize, stdin);         int len = strlen(line);         line[len - 1] = 0;         char** l = createarray(line);          if (l) {             /*why instaed of zero, when l[0]              equals quit, strcmp() returns 10?*/             printf("%d\n", strcmp(l[0], "exit"));             if(strcmp(l[0], "exit")==0) {                 exit(0);             }             else if(fork() == 0) {                 execv(l[0], l);                 printf("%s\n", "error!");             }         }     }     return 1; } 

regarding second issue

2. program got compiled works odd number of arguments. example, if input "/bin/echo good", prints "this good" if input "/bin/echo good", prints "error". 

try corrected code given below. works. issue doesn't exist anymore.