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 Programming Code Editor:
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Previous: Write a C program which will invoke the command processor to execute a command.
Next: Write a C program to convert a string to a long integer.
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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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