Explain how this code works. #include<stdio.h> void upper_string(char*); int mai

Question

Explain how this code works.

#include<stdio.h>

void upper_string(char*);

int main()
{
char string[2000];
int con=1;

while(con == 1)
{
// reading entire line in to char array string
printf("Enter a sentence to convert it into upper case ");
scanf(" %[^ ]",string);
  
// function to convert lower case sentence to upper case
upper_string(string);

printf(" Entered sentence in upper case is "%s" ", string);
  
printf(" Press 1 to Continue or any other number to exit...... ");
scanf("%d",&con);

}
return 0;

}

void upper_string(char *string)
{
while(*string)
{
if ( *string >= 'a' && *string <= 'z' )
{
*string = *string - 32;
}
string++;
}
}

Explanation / Answer

The main part of code reside at here:

void upper_string(char *string)
{
while(*string)
{
if ( *string >= 'a' && *string <= 'z' )
{
*string = *string - 32;
}
string++;
}

As you know that this code convert the lower case string to upper case

Here is explaination of each line in upper_string()

here string is pointer variable

void upper_string(char *string)
{
// loop each character in string
while(*string)
{
// check if character is lower case
if ( *string >= 'a' && *string <= 'z' )
{
// convert the character to upper case
*string = *string - 32;
}
// incrementing the string to point to next character
string++;
}
}

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