Conditional Rendering in React Complete Guide with Examples 2026

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  Conditional Rendering in React Conditional Rendering is one of the most useful concepts in React. It means showing different content on the screen depending on a condition. For example: If a user is logged in → show Logout If a user is not logged in → show Login If a student has passed → show Congratulations If a product is available → show Buy Now If data is loading → show Loading... React does not have a separate if rendering tag. Instead, we use normal JavaScript conditions such as if, the ternary operator, &&, and switch to decide what should appear in the UI.
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C Program to Display a Hollow Diamond Shape with Star

C Program  Pattern

C Program to Display a Hollow Diamond Shape with Star


C Program to print Hollow Diamond Star Pattern
Example :-


#include <stdio.h>
#include <stdlib.h>
int main()
{
int i,j,rows;
printf("Enter the number \n");
scanf("%d",&rows);


for(i=1; i<=rows; i++){
for(j=rows; j>i; j--){
printf(" ");
}


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


if(i==1){
printf("\n");
}


else{
printf("*\n");
}
}

for(i=rows-1; i>=1; i--){
for(j=rows; j>i; j--){
printf(" ");
}


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


if(i==1){
printf("\n");
}


else{
printf("*\n");
}
}
return 0;
}



C Program to Display a Hollow Diamond Shape with Star
Explain Program

Step :1

Header and main function

#include <stdio.h>

#include <stdlib.h>

 int main()

{

    int i, j, rows;

  • #include <stdio.h>:  - use printf() , scanf() for input/output.
  • #include <stdlib.h>:  -use 
  • int i, j, rows; :-- Loop variables i & j, and rows is the number of rows input by the user

Step :2

User Input

printf("Enter the number \n");

scanf("%d", &rows);

  •  enter how many rows the upper half of the diamond 

  •  rows = 5, diamond will have 2 * rows - 1 = 9 lines total.

Step :3

Top Half of the Hollow Diamond

for(i = 1; i <= rows; i++) {

    for (j = rows; j > i; j--) {

        printf(" ");

    }

     printf("*");

     for(j = 1; j < (i - 1) * 2; j++) {

        printf (" ");

    }

     if (i == 1) {

        printf("\n");

    } else {

        printf ("*\n");

    }

}


How it work:

  • i represent to the current row number 
  • First inner loop (for (j = rows; j > i; j--))
  • Print spaces to align the star to the center.
  • printf("*"); Print the first star the line.
  • Second inner loops (for (j = 1; j < (i - 1) *2;  j++ ))
  • Prints the hollow spaces between two stars.
  • On line 1: no space.
  • On line 2: 1 space.
  • On line 3: 3 spaces.
  • Final if:
  •  first line (i == 1), only one * is printed (no second star).
  • From line 2 onwards, two *s are printed with space in between.

Step :4

Bottom Half of the Hollow Diamond

for(i = rows - 1; i >= 1; i--) {

    for(j = rows; j > i; j--) {

        printf(" ");

    }

     printf("*");

     for(j = 1; j < (i - 1) * 2; j++) {

        printf(" ");

    }

     if(i == 1) {

        printf("\n");

    } else {

        printf("*\n");

    }

}

How it work:

  • This is a mirror of the top half but in reverse.
  • i from rows - 1 down to 1 to avoid repeating the middle line.
  • Same logic applies:
  • Print leading spaces.
  • Print one *.
  • Print hollow middle spaces if needed.
  • Print second * if not the last line.

Step :5

 Program Exit

return 0;

}

successful program execution.

C Program to print Hollow Diamond Star Pattern

Output:-

C Program to print Hollow Diamond Star Pattern


Related Post :- 

c program to print full pyramid of star

C program to print inverted half

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