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C Exercises: Convert a string to a double

C Variable Type : Exercise-14 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 ()
	{
		double num1,num2;
		char my_array [256];
		printf ( "\n Input a number : " );
		fgets (my_array, 256, stdin);	
		num1 = atof (my_array);
		num2 = num1/2;
		printf (" The original number is : %f \n", num1);
		printf (" After division by 2 the number is : %f\n\n", num2);
		return 0;
	}

Sample Output:

Input a number : 25                                                                                          
The original number is : 25.000000                                                                           
After division by 2 the number is : 12.500000  

Flowchart:

C Exercises Flowchart: Perform a binary search in an array

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