Question

an example of a code using pointers in C.

Answer 1

#include<stdio.h>

#include<stdlib.h>

#include<stdbool.h>

// get the string from user and point it by originalString

void getString(char *originalString);

// print the string

void displayString(char *);

// return true if the character is to be converted

bool determineIfConvert(char);

// convert character

void convert (char *);

int main()

{

    // create char array of size 11

    char *originalString = (char *)malloc(11 * sizeof(char));

    char *convertedString = (char *)malloc(11 * sizeof(char));

   

    printf("Enter your string:\n");

   

    // get the string fom user

    getString(originalString);

   

    int i;

    char *ptr1, *ptr2;

   

    for( i = 0 ; *(originalString + i) != '\0' ; i++)

    {

        // store the current char in convertedString

        *(convertedString + i) = *(originalString + i);

       

        // if the character is a small letter

        if(determineIfConvert(*(originalString + i)))

            // convert it into capital letter

            convert((convertedString + i));

    }

   

    printf("\nOriginal string is\n");

    displayString(originalString);

   

    printf("\n\nConverted string is\n");

    displayString(convertedString);

   

    return 0;

}

// get the string from user and point it by originalString

void getString(char *originalString)

{

    // read upto 10 character in the string

    scanf("%10s", originalString);

}

// print the string

void displayString(char *str)

{

    // point ptr to str

    char *ptr = str;

   

    // print string character by character

    for(; *ptr != '\0'; ptr++)

        printf("%c",*ptr);

}

// return true if the character is to be converted

bool determineIfConvert(char ch)

{

    int ascii = (int)ch;

   

    // if ch is a lower case character

    if(ascii >= 97 && ascii <= 122)

        return true;

       

    return false;

}

// convert character

void convert (char *str)

{

    int ascii = (int)(*str);

   

    // set the ascii of capital letter

    ascii -= 32;

   

    *str = (char)ascii;

}

Sample Output

Enter your string: abcdeF Original string is abcdeF Converted string is ABCDEF