Question

How to format currency into millions of dollars in C

Answer 1

#include <stdio.h>

void format_millions(double amount, char *out, size_t size) {
    double millions = amount / 1e6;
    
    snprintf(out, size, "$%.2fM", millions);
}

int main() {
    char buf[32] = "";
    
    format_millions(12500000.0, buf, sizeof(buf));
    
    printf("%s\n", buf);   // $12.50M
    
    return 0;
}


/*
run:

$12.50M

*/

 

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Answer 2

#include <stdio.h>

void print_millions(double amount) {
    printf("$%.2fM", amount / 1e6);
}

int main() {
    print_millions(987654321.0);   // $987.65M
    
    return 0;
}


/*
run:

$987.65M

*/

 

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