Example:
Required knowledge
Basic C programming, Loop, ArrayProgram to print the perfect square number pattern
/** * C program to print perfect square number pattern */ #include <stdio.h> #define SIZE 10 //Size is always even int main() { int i, j, N; int board[SIZE][SIZE]; int left, top; left = 0; top = SIZE - 1; N = 1; for(i=1; i<=SIZE/2; i++, left++, top--) { //Fill from left to right for(j=left; j<=top; j++, N++) { board[left][j] = N; } //Fills from top to down for(j=left+1; j<=top; j++, N++) { board[j][top] = N; } //Fills from right to left for(j=top-1; j>=left; j--, N++) { board[top][j] = N; } //Fills from down to top for(j=top-1; j>=left+1; j--, N++) { board[j][left] = N; } } //Print the pattern for(i=0; i<SIZE; i++) { for(j=0; j<SIZE; j++) { printf("%-5d", board[i][j]); } printf("\n"); } return 0; }
Note: If you want to generate the perfect square of any number other than 10. Then you only need to change this line #define SIZE 10 to any other integer.
Output
1 2 3 4 5 6 7 8 9 10 36 37 38 39 40 41 42 43 44 11 35 64 65 66 67 68 69 70 45 12 34 63 84 85 86 87 88 71 46 13 33 62 83 96 97 98 89 72 47 14 32 61 82 95 100 99 90 73 48 15 31 60 81 94 93 92 91 74 49 16 30 59 80 79 78 77 76 75 50 17 29 58 57 56 55 54 53 52 51 18 28 27 26 25 24 23 22 21 20 19
Screenshot
Happy coding ;)