totalb.c

linux下的Ｃ语言开发

/*-*/
/********************************************************
 * Program:						*
 *	Total						*
 *							*
 * Purpose:						*
 *	Compute the total of a list of numbers.		*
 *	But don't totaled the negative ones.		*
 *							*
 * Usage:						*
 *	Run the program.  Type in the numbers one at a	*
 *	time.  When you reach the end, type a 0 to	*
 *	exit the program.				*
 *							*
 * 	Negative numbers are counted, but not totaled	*
 ********************************************************/
/*+*/
#include <stdio.h>
char  line[100];   /* line from input */
int   total;       /* Running total of all numbers so far */
int   item;        /* next item to add to the list */
int   minus_items; /* number of negative items */

int main()
{
    total = 0;
    minus_items = 0;

    while (1) {
        printf("Enter # to add\n");
        printf("  or 0 to stop:");

        fgets(line, sizeof(line), stdin);
        sscanf(line, "%d", &item);

        if (item == 0)
            break;

        if (item < 0) {
            ++minus_items;
            continue;
        }
        total += item;
        printf("Total: %d\n", total);
    }

    printf("Final total %d\n", total);
    printf("with %d negative items omitted\n",
                   minus_items);
    return (0);
}