Replace space with newline - c

Question

I'm trying to do a space with line replacer for Ti-89 calculators so that I can print lines without them being cut because of the horizontal character length. They would normally look like so
This is a pretty long test
ing for the Ti89 Calculator
and I would like them to look like so
This is a pretty long
testing for the Ti89
Calculator
I tried to do it with this code
void _print_line(char* string)
{
int k = strlen(string);
if(k > 26)
{
int n = 0;
int c = 25;
while(n == 0)
{
if(string[c] == 32)
{
n = 1;
}
else
{
c--;
}
if(c <= 0)
{
n = 2;
}
}
if(n == 1)
{
string[c] == '\n';
}
}
printf("%s\n", string);
}
But it seems to just ignore it and keep printing it like the first example.

Answer 1

You are not inserting the carriage return.
Replace
string[c] == '\n';
With
string[c] = '\n';

Answer 2

As Till said, you are not inserting the carriage return. The line
string[c] == '\n';
needs to be
string[c] = '\n';
With the difference being one "equals" sign versus two.
The reason is because "==" is a conditional operator which evaluates to either true or false, while "=" is the assignment operator which sets a value to a variable.

Answer 3

There needs to be processed for the entire string.
Keep a record of the current output character position to check whether or not exceed the specified width when you output the next word.
like this:
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define DISP_OUT stdout
#define DISP_WIDTH 26
int disp_one(char ch){
static int pos;
fputc(ch, DISP_OUT);
if(ch == '\n')
pos = 0;
else
++pos;
if(pos == DISP_WIDTH){
fputc('\n', DISP_OUT);
pos = 0;
}
return pos;
}
typedef enum word_break {
KEEP, BREAK
} WORD_BREAK;
void disp(const char *str, WORD_BREAK word_break){
static int pos;
switch(word_break){
case BREAK:
while(*str){
pos = disp_one(*str++);
}
break;
case KEEP:
while(*str){
if(isspace((unsigned char)*str)){
pos = disp_one(*str++);
continue;
}
const char *end = str;//end : word end (find delimiter)
while(*end && !isspace((unsigned char)*end))
++end;
int len = end - str;//length of next output word
if(pos + len >= DISP_WIDTH && len < DISP_WIDTH){
pos = disp_one('\n');
}
while(str < end){
pos = disp_one(*str++);
}
}
break;
}
}
int main(void){
char *text = "This is a pretty long testing for the Ti89 Calculator";
disp(text, BREAK);
disp("\n", BREAK);
disp(text, KEEP);
return 0;
}