Simple2Code

String Pattern Programs in C

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In this tutorial, we will write various C pattern programs for String. Before that, you may go through the following topics in C.

C Pyramid String Pattern: 1

Enter the string: SIMPLE2CODE
Enter the no. of rows: 8
S
I M
P L E
2 C O D
E S I M P
L E 2 C O D
E S I M P L E
2 C O D E S I M

Source Code:

#include <stdio.h>

void main()
{
   char str[20];
   int rows, a = 0;

   printf("Enter the string: ");
   scanf("%[^\n]", str);
   printf("Enter the no. of rows: ");
   scanf("%d", &rows);

   for (int i = 0; i <= rows - 1; i++)
   {
      for (int j = 0; j <= rows - i; j++)
         printf(" ");

      for (int k = 0; k <= i; k++)
      {
         printf("%2c", str[a++]);

         if (str[a] == '\0')
            a = 0;
      }

      printf("\n");	// for new line
   }
}

Mirrored half diamond string pattern in C: 2

Enter the string: SIMPLE2CODE
S
SI
SIM
SIMP
SIMPL
SIMPLE
SIMPLE2
SIMPLE2C
SIMPLE2CO
SIMPLE2COD
SIMPLE2CODE
IMPLE2CODE
MPLE2CODE
PLE2CODE
LE2CODE
E2CODE
2CODE
CODE
ODE
DE
E

Source Code:

#include <stdio.h>

void main()
{
   char str[20];
   int strLength;

   printf("Enter the string: ");
   scanf("%[^\n]", str);

  	// count the no. of characters
   for (strLength = 0; str[strLength] != '\0'; strLength++);

  	// for first half
   for (int i = 0; i < strLength; i++)
   {
      for (int j = 0; j < strLength - i - 1; j++)
         printf(" ");	// space

      for (int j = 0; j <= i; j++)
         printf("%c", str[j]);

      printf("\n");	// for a new line
   }

  	// for second half
   for (int i = 1; i < strLength; i++)
   {
      for (int j = 0; j < i; j++)
         printf(" ");	// space

      for (int j = i; j < strLength; j++)
         printf("%c", str[j]);

      printf("\n");	// for a new line
   }
}

Half diamond string pattern in C: 3

Enter the string: SIMPLE
S
SI
SIM
SIMP
SIMPL
SIMPLE
IMPLE
MPLE
PLE
LE
E

Source Code:

#include <stdio.h>

void main()
{
   char str[20];
   int strLength;

   printf("Enter the string: ");
   scanf("%[^\n]", str);

  	// count the no. of characters
   for (strLength = 0; str[strLength] != '\0'; strLength++);

  	// for first half
   for (int i = 0; i < strLength; i++)
   {
      for (int j = 0; j <= i; j++)
         printf("%c", str[j]);

      printf("\n");	// for a new line
   }

  	// for second half
   for (int i = 1; i < strLength; i++)
   {
      for (int j = i; j < strLength; j++)
         printf("%c", str[j]);

      printf("\n");	// for a new line
   }
}

Half diamond string pattern in C: 4

Enter a string: PROGRAM
P
PR
PRO
PROG
PROGR
PROGRA
PROGRAM
PROGRA
PROGR
PROG
PRO
PR
P

Source Code:

#include <stdio.h>
#include <stdlib.h>

void main()
{
   char str[20];
   int len, place;

   printf("Enter a string: ");
   scanf("%[^\n]", str);

  	// find the length of the string
   for (len = 0; str[len] != '\0'; len++);
   len--;

   for (int i = 0; i < (2 *len + 1); i++)
   {
      if (i < len) place = i;
      else place = abs(2 *len - i);

      for (int j = 0; j <= place; j++)
         printf("%c", str[j]);

      printf("\n");
   }
}

Half Pyramid String Pattern in C: 5

Enter a string: PROGRAM
P
PR
PRO
PROG
PROGR
PROGRA
PROGRAM

Source Code:

#include <stdio.h>

void main()
{
   char str[20];

   printf("Enter a string: ");
   scanf("%[^\n]", str);

   for (int i = 0; str[i] != '\0'; i++)
   {
      for (int j = 0; j <= i; j++)
         printf("%c", str[j]);

      printf("\n");	// new line
   }
}

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