/ ************************************************************************ * * Purpose: To read numbers entered by the user and sort them. * Author: M.J.Leslie * Date: 30-Nov-94 * ************************************************************************/ /********** Preprocessor ***********************************************/ #include <stdlib.h> #include <stdio.h> #include <string.h> /********** Functions ***************************************************/ int read_nums(int *); void display_nums(int *); int comp_nums(const int *, const int *); /********** main ********************************************************/ main() { int numbers[30]; /* Numbers to be sorted. */ int how_many=0; /* Number of numbers entered */ /* Get the numbers */ how_many = read_nums(numbers); puts("\nThese are the unsorted numbers\n"); display_nums(numbers); /* SORT the numbers held in * 'numbers'. */ qsort( numbers, /* Pointer to elements */ how_many, /* Number of elements */ sizeof(int), /* size of one element. */ (void *)comp_nums /* Pointer to comparison function */ ); puts("\nThese are the sorted numbers\n"); display_nums(numbers); } /************************************************************************ * * comp_nums: Compare two numbers. * ************************************************************************/ int comp_nums(const int *num1, const int *num2) { if (*num1 < *num2) return -1; if (*num1 == *num2) return 0; if (*num1 > *num2) return 1; } /************************************************************************ * * readnums: read numbers from the keyboard and put them into an array. * ************************************************************************/ int read_nums(int *array) { char data[80]; /* Data entered by the user */ int inc=0; puts("\n\tPlease enter some integer numbers"); puts("\tno checking is made on the data you enter...."); printf("\t==> "); gets(data); /* Assume we have valid data. * Put it into an array. */ *(array+inc) = atoi(strtok(data," ")); inc++; while ( *(array+inc) = atoi(strtok(NULL," "))) inc++; /* Return the number of items * stored in 'array'. */ return inc++; } /************************************************************************ * * display_nums: Display the numbers * ************************************************************************/ void display_nums(int *array) { /* NULL is a pointer to 0, * so it must be cast to an * integer */ while ( *array != (int)NULL) { printf("%d ",*array); array++; } puts(""); }
file: /Techref/language/ccpp/Cref/EXAMPLES/qsort2.c, 2KB, , updated: 1997/4/21 08:52, local time: 2024/12/23 03:16,
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