len.c

来自「linux下的Ｃ语言开发」· C语言 代码 · 共 43 行

/********************************************************
 * Question:						*
 *	Why does this program always report the length	*
 *	of any string as 0?				*
 *							*
 * A sample "main" has been provided.  It will ask 	*
 * for a string and then print the length.		*
 ********************************************************/
#include <stdio.h>

/********************************************************
 * length -- compute the length of a string             *
 *                                                      *
 * Parameters                                           *
 *      string -- the string whose length we want       *
 *                                                      *
 * Returns                                              *
 *      the length of the string                        *
 ********************************************************/
int  length(char string[])
{
    int             index;      /* index into the string */

    /*
     * Loop until we reach the end of string character
     */
    for (index = 0; string[index] != '\0'; ++index)
        /* do nothing */
    return (index);
}

int main()
{
     char line[100];	/* Input line from user */

     while (1) {
        printf("Enter line:");
        fgets(line, sizeof(line), stdin);

	printf("Length (including newline) is: %d\n", length(line));
    }
}