String Pattern Programs in C3 min read

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:

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#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:

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#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:

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#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:

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#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:

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#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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