nix_usinflation

United States of America Dollar inflation calculator
git clone https://0xdd.org/code/nix_usinflation.git
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main.c (1029B)

      1 /*
      2 2018 David DiPaola
      3 licensed under CC0 (public domain, see https://creativecommons.org/publicdomain/zero/1.0/)
      4 */
      5 
      6 #include <stdio.h>
      7 
      8 #include <stdlib.h>
      9 
     10 #include "data.h"
     11 
     12 int
     13 main(int argc, char * argv[]) {
     14 	if (argc < 4) {
     15 		fprintf(stderr, "syntax: usinflation <start year> <start amount> <end year>" "\n");
     16 		return 1;
     17 	}
     18 	int   start_year   = atoi(argv[1]);
     19 	float start_amount = (float)atof(argv[2]);
     20 	int   end_year     = atoi(argv[3]);
     21 
     22 	if ((start_year < DATA_STARTYEAR) || (start_year > DATA_ENDYEAR)) {
     23 		fprintf(stderr, "ERROR: start year: %i is invalid. valid years are %i-%i" "\n", start_year, DATA_STARTYEAR, DATA_ENDYEAR);
     24 		return 2;
     25 	}
     26 	if ((end_year < DATA_STARTYEAR) || (end_year > DATA_ENDYEAR)) {
     27 		fprintf(stderr, "ERROR: end year: %i is invalid. valid years are %i-%i" "\n", end_year, DATA_STARTYEAR, DATA_ENDYEAR);
     28 		return 3;
     29 	}
     30 
     31 	float ratio = DATA[end_year-DATA_STARTYEAR] / DATA[start_year-DATA_STARTYEAR];
     32 	float end_amount = ratio * start_amount;
     33 	printf("%G" "\n", end_amount);
     34 	return 0;
     35 }
     36