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C Exercises: Convert a string to an unsigned long integer

C Variable Type : Exercise-2 with Solution

Write a C program to convert a string to an unsigned long integer.

Sample Solution:

C Code:

#include<stdio.h>
#include<stdlib.h>
	int main ()
	{
		char buffer[123];
		unsigned long ul;
		printf ("\nInput an unsigned number: ");
		fgets (buffer,123,stdin);

		ul = strtoul (buffer,NULL,0);
		printf ("Output: %lu\n\n",ul);
		return 0;
	}

Sample Output:

Input an unsigned number: 25                                                                                  
Output: 25  

Flowchart:

C Exercises Flowchart: Convert a string to an unsigned long integer

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