An Ultimate Guide To Learn Everything On Pseudo-Code In C

What Is Pseudo-Code in C?

The pseudocode in C is an informal way of writing a program for better human understanding. It is written in simple English, making the complex program easier to understand. 

Pseudocode cannot be compiled or interpreted. It doesn't follow the programming language's syntax; it is thus written in pseudocode so that any programmers or non-programmers can easily understand it. 

Consider the following source code example:

Int  n = 10

for( i=0;i<n;i++)

printf(n);

The above source code is converted into a pseudo-code to understand in a better way.

The value ten is assigned to the variable n.

For value = zero to less than a number.

Display the numbers.

Algorithm:

Consider the above image as an example of how the factory workers are supplying the packages. The other workers are tracking items, and engineers are processing the business report; In general, the whole process is done step by step. 

Similarly, you have C programming language algorithms, which follow a step-by-step procedure to solve a problem. You have the algorithm to execute a set of instructions in a particular order to get an output.

You will go through a few examples that will help you understand how to write Pseudo-code in C.

Algorithm for the Program Factorial of a Given Number.

Step 1: start 

Step 2: initialize fact = 1

Step 3: input from the user value n

Step 4: for i=1 to i <= n repeat the process

Step 5: fact = fact * i

Step 6: i++ [increament i by one]

Step 7: print fact value

Step 8: stop

Now let’s implement pseudo-code from the above algorithm.

Start program

Declare fact and n 

Enter number for n 

for i=1 to i <=n 

Perform fact = fact * i

Display fact

End program

By referring to the above pseudo-code, create a program for factorial of a given number using for loop.

Source Code:

#include <stdio.h>

void main()

{

int n, fact=1,i;

printf("enter value for n");

scanf("%d",&n);

for(i=1; i<=n; i++)

{

fact=fact*i;

}

printf("\n factorial of %d is %d", n, fact);

}

Output: 

Now that you have understood pseudo-code writing in C and executing a program from it. 

It is time to consider another example.

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Algorithm to Find the Sum of Natural Numbers.

Step 1: start

Step 2: declare and initialize

            n, sum = 0 and i

Step 3: Input number n

Step 4: for i=1 to i<=n

Step 5: sum = sum + i

Step 6: i++ [increment i value by one]

Step 7: print sum

Step 8: stop

Let’s implement pseudo-code from the above algorithm.

Start program 

Declare variables n, sum = 0 and i

Enter the number for n

For i=1 to i<=n

Perform operation sum = sum + i

Increment i value by one

Print sum

End program

Hence, from the above pseudo-code, it becomes easy to understand the logic of the program.

Now, turn out pseudo-code into the program to find the sum of natural numbers.

Source Code:

#include <stdio.h>

void main()

{

int n, sum=0, i;

printf("enter the number of terms:");

scanf("%d", &n);

for(i=1; i<=n; i++)

{

sum = sum+i;

}

printf("sum of series=%d",sum);

}

Output:

Up next, you have another example program on the Fibonacci series.

Now, perform the same steps to implement the program from the pseudo-code.

Algorithm: 

Step 1: start

Step 2: declare and initialize

            n, i = 0

Step 3: input number n

Step 4: while ( i < n)

            ++i

 Step 5: if ( n ==0) || (n == 1)

            return 0

            else 

            if(n == 2)

            return 1

            else

            return (fib (n-1) + fib (n-2))

Step 6: print fibonacci series

Step 7: stop 

Let’s implement pseudo-code from the above algorithm.

Start program

Declare variables n and i = 0

Enter the number for n to generate fibonacci series

while i < n

++i  [ increment i value ]

if n ==0 or n ==1

Return 0

if (n ==2 )

Return 1

else

Return ( fib(n-1) + fib (n-2))

Print fibonacci series

End program

Followed by pseudo-code, generate the Fibonacci series program.

Source Code:

#include <stdio.h>

fib (int n)

{

if(n==0 || n==1)

return 0;

else 

if(n==2)

return (1);

else return (fib(n-1)+fib(n-2));

}

void main()

{

int n,i=0;

printf("enter the number to generate fibonacci series:");

scanf("%d",&n);

printf("fibonacci series:\n");

while(i<n)

{

++i;

printf("%d \n",fib(i));

}

}

Output:

You will go through a few advantages and disadvantages for a better understanding.

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Advantages and Disadvantages of Pseudo-Code in C

• It is easy to understand even a complex program
• It does not follow C programming language syntax
• C programs can be easily generated by pseudo-code
• It allows us to understand the logic of a program very quickly 
• Pseudo-code can be modified easily 

Disadvantages of Pseudo-Code in C

• Unlike the c programs, a pseudo-code cannot be compiled or interpreted from which errors cannot be identified 
• As pseudo-code can be written in any order, so it becomes difficult to understand the flow of a program 

Next Steps

"Data Structures in C" can be your next topic. So far, you have learned the pseudo-code in the C programming language. The next fundamentals will be the data structures and the varieties in data structures used for different purposes.

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