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C Exercises: Convert a string to double

C Variable Type : Exercise-4 with Solution

Write a C program to convert a string to a double.

Sample Solution:

C Code:

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

int main ()
	{
		char input[] = "8.0 2.0";
		char * ptr_end;
		double x, y;

		x = strtod (input,&ptr_end);
		y = strtod (ptr_end,NULL);

		printf ("\nOutput= %.2lf\n\n", x/y);
		return 0;
	}
	

Sample Output:

Output= 4.00 

Flowchart:

C Exercises Flowchart: Convert a string to double

C Programming Code Editor:

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C Programming: Tips of the Day

How I can print to stderr in C?

The syntax is almost the same as printf. With printf you give the string format and its contents i.e.:

printf("my %s has %d chars\n", "string format", 30);

With fprintf it is the same, except now you are also specifying the place to print to:

File *myFile;
...
fprintf( myFile, "my %s has %d chars\n", "string format", 30);

Or in your case:

fprintf( stderr, "my %s has %d chars\n", "string format", 30);

Ref : https://bit.ly/3v5U8Zq