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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

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP