C

Chapter 17

Review Exercises

17.1 Write a program that reads its command line arguments and allocates memory to store them.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int main(int argc, char *argv[])

{

char *tot_str;

int i, tot_chars;

if(argc == 1)/* Check if there is only one argument. */

{

printf("Missing arguments…\n");

exit(1);

}

tot_chars = 0; /* It counts the characters of all arguments. */

for(i = 1; i < argc; i++)/* Remember that argv[1] points to the first argument, argv[2] to the second one, and so forth. argv[0] points to the name of the program. */

tot_chars += strlen(argv[i]);

tot_str = (char *) malloc(tot_chars+1); /* Allocate an extra place for the null character. */

if(tot_str == NULL)

{

printf("Error: Not available ...