Patterns Programs in C [20 Patterns]

Solving pattern programs in C is the best way to improve our iteration logic and programming skills. Here in this post, I have listed 20 different patterns with solutions in the C programming language.

patterns in C
patterns in C(2)

Pattern 1:

    *
   ***
  *****
 *******
*********
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=MAX-i; j++){
      printf(" ");
    }

    for(int k=1; k<2*i; k++){
      printf("*");
    }

    printf("\n");
  }
  return 0;
}

Pattern 2:

    1
   222
  33333
 4444444
555555555
#include <stdio.h>
#define MAX 5
 
int main()
{
  int i,j,k;

  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=MAX-i; j++){
      printf(" ");
    }

    for(int k=1; k<2*i; k++){
      printf("%d",i);
    }

    printf("\n");
  }

  return 0;
}

Pattern 3:

    *
   **
  ***
 ****
*****
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=MAX-i; j++){
      printf(" ");
    }

    for(int k=1; k<=i; k++){
      printf("*");
    }
    
    printf("\n");
  }
  
  return 0;
}

Pattern 4: 

    1
   22
  333
 4444
55555
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=MAX-i; j++){
      printf(" ");
    }

    for(int k=1; k<=i; k++){
      printf("%d",i);
    }

    printf("\n");
  }

  return 0;
}

Pattern 5:

 *********
  *******
   *****
    ***
     *
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=i; j++){
      printf(" ");
    }

    for(int k=1; k<=2*(MAX-i)+1; k++){
      printf("*");
    }

    printf("\n");
  }

  return 0;
}

Pattern 6:

 111111111
  2222222
   33333
    444
     5
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    for(int j=1; j<=i; j++){
      printf(" ");
    }

    for(int k=1; k<=2*(MAX-i)+1; k++){
      printf("%d",i);
    }
    
    printf("\n");
  }

  return 0;
}

Pattern 7:

1
12
123
1234
12345
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=i; j++){
      printf("%d",j);
    }
 
    printf("\n");
  }

  return 0;
}

Pattern 8:

1
22
333
4444
55555
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=i; j++){
      printf("%d",i);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 9:

11111
2222
333
44
5
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=MAX-i+1; j++){
      printf("%d",i);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 10:

12345
1234
123
12
1
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=MAX-i+1; j++){
      printf("%d",j);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 11:

54321
5432
543
54
5
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=MAX; i>=0; i--){
 
    for(int j=MAX; j>MAX-i; j--){
      printf("%d",j);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 12:

5
54
543
5432
54321
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=MAX; i>=1; i--){
 
    for(int j=MAX; j>=i; j--){
      printf("%d",j);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 13:

    1
   121
  12321
 1234321
123454321
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
      
    //For left Space
    for(int j=1; j<=MAX-i; j++){
      printf(" ");
    }

    //1st middle half
    for(int k=1; k<=i; k++){
      printf("%d",k);
    }

    //2nd middle half
    for(int k=i-1; k>=1; k--){
      printf("%d",k);
    }

    printf("\n");
  }

  return 0;
}

Pattern 14:

1
21
321
4321
54321
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=i; j>=1; j--){
      printf("%d",j);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 15:

1
10
101
1010
10101
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=i; j++){
      //Output remainder by dividing with 2
      printf("%d", j%2);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 16:

101010
010101
101010
010101
101010
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=i; j<=MAX+i; j++){
      printf("%d",j%2);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 17:

10000
02000
00300
00040
00005
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=MAX; j++){
      if(i== j)
        printf("%d",i);
      else
        printf("%d",0);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 18:

11111
01111
00111
00011
00001
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){
 
    for(int j=1; j<=MAX; j++){
      if(i<= j) 
        printf("%d",1);
      else 
        printf("%d",0);
    }
 
    printf("\n");
  }
  
  return 0;
}

Pattern 19:

1
 2
  3
   4
    5
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    //For left blank space
    for(int j=1; j<i; j++){
        printf(" ");
    }
    
    //Output single digit 'i'
    printf("%d \n",i);
  }

  return 0;
}

Pattern 20:

    1
   2
  3
 4
5
#include <stdio.h>
#define MAX 5
 
int main()
{
  for(int i=1; i<=MAX; i++){

    //For left blank space
    for(int j=i; j<MAX; j++){
      printf(" ");
    }
    
    //Output single digit 'i'
    printf("%d \n",i);
  }
 
  return 0;
}

These are different pattern programs that are often asked in exams and interviews. I advise you to try to solve the pattern by yourself, if stuck then refer to its solution.

Comment below the pattern that is not mentioned here, I will add it to the above list.

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