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 Programming Code Editor:
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Previous: Write a C program to convert a string to a long integer.
Next: Write a C program to generate a random number.
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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
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