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C Programming Starter Kit 2.0
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SamsPublishing-CProgrammingStarterKit-v2.0-Win31.iso
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tyc
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list15_7.c
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C/C++ Source or Header
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1993-10-16
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2KB
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78 lines
/* Inputs a list of strings from the keyboard, sorts them, */
/* then displays them on the screen. */
#include <stdio.h>
#include <string.h>
#define MAXLINES 25
int get_lines(char *lines[]);
void sort(char *p[], int n);
void print_strings(char *p[], int n);
char *lines[MAXLINES];
main()
{
int number_of_lines;
/* Read in the lines from the keyboard. */
number_of_lines = get_lines(lines);
if ( number_of_lines < 0 )
{
puts(" Memory allocation error");
exit(-1);
}
sort(lines, number_of_lines);
print_strings(lines, number_of_lines);
}
int get_lines(char *lines[])
{
int n = 0;
char buffer[80]; /* Temporary storage for each line. */
puts("Enter one line at time; enter a blank when done.");
while ((n < MAXLINES) && (gets(buffer) != 0) &&
(buffer[0] != '\0'))
{
if ((lines[n] = (char *)malloc(strlen(buffer)+1)) == NULL)
return -1;
strcpy( lines[n++], buffer );
}
return n;
} /* End of get_lines() */
void sort(char *p[], int n)
{
int a, b;
char *x;
for (a = 1; a < n; a++)
{
for (b = 0; b < n-1; b++)
{
if (strcmp(p[b], p[b+1]) > 0)
{
x = p[b];
p[b] = p[b+1];
p[b+1] = x;
}
}
}
}
void print_strings(char *p[], int n)
{
int count;
for (count = 0; count < n; count++)
printf("\n%s ", p[count]);
}