Align columns/C

Align columns/C is part of Column Aligner. You may find other members of Column Aligner at Category:Column Aligner.

<lang c>#include <stdio.h>

const char *str = "Given$a$text$file$of$many$lines,$where$fields$within$a$line$\n" "are$delineated$by$a$single$'dollar'$character,$write$a$program\n" "that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$\n" "column$are$separated$by$at$least$one$space.\n" "Further,$allow$for$each$word$in$a$column$to$be$either$left$\n" "justified,$right$justified,$or$center$justified$within$its$column.";

void align(const char *in, char alignment) { int col, i, l, r; int w[1024] = {0}; const char *s;

for (s = in, i = col = 0; s[i]; s += i + 1) { for (i = 0; s[i] && s[i] != '$' && s[i] != '\n'; i++);

if (i > w[col]) w[col] = i;

if (col++ >= 1024) abort(); /* artificial limit */

if (s[i] == '\n') col = 0; if (!s[i]) break; }

for (s = in, i = col = 0; s[i]; s += i + 1) { for (i = 0; s[i] && s[i] != '$' && s[i] != '\n'; i++);

switch(alignment) { case 'l': r = w[col] - i; break; case 'c': r = (w[col] - i)/2; break; case 'r': r = 0; break; } l = w[col++] - i - r + 1;

while (l--) putchar(' '); printf("%.*s", i, s); while (r--) putchar(' ');

if (s[i] != '$') { putchar('\n'); col = 0; } if (!s[i]) break; } }

int main(void) { puts("\n---- right ----"); align(str, 'r'); puts("\n---- left ----"); align(str, 'l'); puts("\n---- center ----"); align(str, 'c'); return 0; }</lang>