11.22 Lab6

introduction-to-computer-science-laboratory-6.pdf

Introduction to Computer Science

Laboratory 6

1. Solve all the exercises present in the tutorial.

2. Write a C program that takes an integer N​ as input and prints an inverted asterisk pyramid with N​ floors. For example, the output with N = 5​ should be:

   ​

   #include <stdio.h>
   
   int main() {
       int number;
       int star = '*';
       printf("Please enter a number to generate an inverted asterisk pyramid:");
       scanf("%d", &number);
       for(int i = 1; i <= number; i++) {
           printf("%*c", i, star);
           for(int j = 1; j <= (number-i); j++) {
               printf(" *");
           }
           printf("\n");
       }
       return 0;
   }
   

3. Write a C program that takes as input the file input_ex2.txt​ and prints to the screen all the characters between braces ([​ and ]​). Hint: Redirect the input of your program to the file input_ex2.txt​.

   #include <stdio.h>
   
   int main() {
       int ch, pch;
       do {
           pch = ch;
           ch = getchar();
           putchar('[');
           putchar(ch);
           putchar(']');
       } while(ch != EOF);
       return 0;
   }
   

‍

1. Write a C program that takes as input the file input_ex3_ex4.txt​ and prints only the uppercase characters.

   #include <stdio.h>
   
   int main() {
       int ch;
       do {
           ch = getchar();
           if(ch >= 'A' && ch <= 'Z') {
               putchar(ch);
           }
       } while(ch != EOF);
       return 0;
   }
   

2. Write a C program that takes as input the file input_ex3_ex4.txt​ and creates a file called output_ex4.txt​ that contains only the lowercase characters of the input.

   Hint: Redirect the output of your program to the file output_ex4.txt​.

   #include <stdio.h>
   
   int main() {
       int ch;
       do {
           ch = getchar();
           if(ch >= 'a' && ch <= 'z') {
               putchar(ch);
           }
       } while(ch != EOF);
       return 0;
   }
   

3. Write two C programs:

4. The first should print the English alphabet.

#include <stdio.h>

int main() {
    int ch = 'A';
  do {
      putchar(ch);
      ch = ch + 1;
  } while(ch <= 'Z');
    return 0;
}

* The second receives a stream of characters and prints the ones whose ASCII code is even.

Hint: Redirect the output of the first program to a file and use it as input for the second one.

#include <stdio.h>

int main() {
    int ch;
  do {
      ch = getchar();
      if(ch % 2 == 0)
          putchar(ch);
  } while(ch != EOF);
    return 0;
}

‍