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infcalc.c
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infcalc.c
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// Simple command-line program to print the rate of inflation.
// Copyright (c) 2018, 2023 Cody Logan, released under the terms of the MIT license.
// SPDX-License-Identifier: MIT
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BSIZE 80 // buffer size constant
int main(int argc, char *argv[]) {
char filename[] = "cpi.csv"; // file to parse
char line[BSIZE]; // char array to hold each line
long year; // long integer representation of year
double cpi; // consumer price index
// open the file for reading
FILE *stream = fopen(filename, "r");
if (stream == NULL) {
printf("Cannot open %s\n", filename);
exit(1);
}
// read filestream line-by-line
while (fgets(line, BSIZE, stream)) {
// TODO: might be a good idea to make a struct for this data.
char *field; // holds individual CSV fields
char *ptr; // holds unconverted portion of the line (if any)
// first field is the year (delimited by a comma)
field = strtok(line, ",");
year = strtol(field, &ptr, 10);
// second field is the CPI value (delimited by a comma or newline)
field = strtok(NULL, ",\n");
cpi = strtod(field, &ptr);
// Discard first line (header)
// This works because the header line is [Year, CPI], so the conversions
// above with strtol() and strtod() result in year and cpi being 0 and
// 0.000000 respectively. The unconverted portion of the line is put in
// ptr, which is first "Year" then, at this point, "CPI".
if (year == 0 && cpi == 0 && strcmp(ptr, "CPI") == 0) {
continue;
}
// print year and CPI (truncated to three decimal places)
printf("CPI for %ld is %.3f\n", year, cpi);
}
// close the filestream
fclose(stream);
}