Thread: How to center text using printf?

The overall width of the line is 20 characters. How can I center a string using print so that

title becomes
space-title-space

i have something like this so far

Code:

fprintf(myfile, "%20s\n",mystring);

Do a simple calculation. For example, "title" has a length of 5, so there must be 15 spaces. Therefore, to centre the text, you should insert (15 / 2) = 7 spaces (or 8, if you prefer to round up).

>> Therefore, to center the text, you should insert (15 / 2) = 7 spaces
Don't forget that the field-width needs to include the length of the string - since it's in the field.

Code:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#ifdef _WIN32
#include <Windows.h>
int GetColumnWidth()
{
    CONSOLE_SCREEN_BUFFER_INFO info;
    HANDLE out;
    
    if (!(out = GetStdHandle(STD_OUTPUT_HANDLE)) ||
        !GetConsoleScreenBufferInfo(out, &info))
        return 80;
    return info.dwSize.X;
}//GetColumnWidth
#else
int GetColumnWidth() {return 80;}
#endif

int main()
{
    const char *s = "Hey, I'm centered!";

    const int total_width = GetColumnWidth();
    const int s_width = strlen(s);
    const int field_width = (total_width - s_width) / 2 + s_width;

    printf("%*s\n", field_width, s);

    return 0;
}//main

gg