K and R C, Solution to Exercise 1-18:
Remove trailing blanks and tabs from each line of input, and to delete entirely blank lines. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .
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#include "stdio.h"
#define MAXLINE 1000
int get_lines(char line[], int maxline);
int char remove(char str[]);
main()
{
char line[MAXINLINE];/* current input line */
while((get_lines(line,MAXINLINE))>0)
if(remove(line)> 0)
printf("%s", line);
return 0;
}
/*
remove trailing blanks and tabs from character string str
*/
int remove(char str[])
{
int i=0;
while(str[i] !='n')
++i;
--i;
while(i>=0 && (str[i]==' ' || str[i]=='t'))
--i;
if(i>=0)
{
++i;
s[i]='n';
++i;
s[i]=' ';
}
return i;
}
/* getline: read a line into str, return length */
int get_lines(char str[], int line)
{
int c, i, j;
for(i = 0, j = 0; (c = getchar())!=EOF && c != 'n'; ++i)
{
if(i < line - 1)
{
str[j++] = c;
}
}
if(c == 'n')
{
if(i <= line - 1)
{
str[j++] = c;
}
++i;
}
str[j] = ' ';
return i;
}
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