Question

How to convert string to double in C

Answer 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    double d;
    char *s = "89.3% use c", *p;

    d = strtod(s, &p);

    printf("s = %s\np = %s \nd = %.2f\n", s, p, d);
    
    return 0;
}



/*
run:
 
s = 89.3% use c
p = % use c
d = 89.30

*/

 

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Answer 2

#include <stdio.h>
 
int main() {
    char s[] = "13837389.43";
 
    double d;
 
    sscanf(s, "%lf", &d);
 
    printf("%8.3lf", d);
 
    return 0;
}
 
 
 
 
/*
run:
 
13837389.430
 
*/

 

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