21st-Century-Examples/papersize.c at master · lanner17/21st-Century-Examples · GitHub

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/* Compile with:
export CFLAGS="-g -Wall -std=gnu11 -O3"  #the usual.
make papersize
*/
#include <stdio.h>
#include <strings.h> //strcasecmp (from POSIX)
#include <math.h>    //NaN

typedef struct {
    double width, height;
} size_s;

size_s width_height(char *papertype){
  return
    !strcasecmp(papertype, "A4")     ? (size_s) {.width=210, .height=297}
  : !strcasecmp(papertype, "Letter") ? (size_s) {.width=216, .height=279}
  : !strcasecmp(papertype, "Legal")  ? (size_s) {.width=216, .height=356}
                                     : (size_s) {.width=NAN, .height=NAN};
}

int main(){
    size_s a4size = width_height("a4");
    printf("width= %g, height=%g\n", a4size.width, a4size.height);
}