C Program to Find Ceiling & Floor of X given a Sorted Array & a value X

This C Program calculates ceiling & floor of X given a sorted array & a value X.

Here is source code of the C Program to calculate ceiling & floor of X given a sorted array & a value X. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C Program to Find Ceiling & Floor of  X given a Sorted Array & a value X

```
 */
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```
 #include <stdio.h>
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```
 
```

/* Function to get index of ceiling of x in arr[low..high] */

int ceilSearch(int arr[], int low, int high, int x)

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{
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```
     int i;
```
```
 
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    /* If x is smaller than or equal to first element,then return the first element */

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    if (x <= arr[low])
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    return low;
```
```
 
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   /* Otherwise, linearly search for ceil value */

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   for (i = low; i < high; i++)
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```
   {
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       if (arr[i] == x)
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          return i;
```
```
 
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       /* if x lies between arr[i] and arr[i+1] including arr[i+1], then return arr[i+1] */

       if (arr[i] < x && arr[i + 1] >= x)

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           return i + 1;
```
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   }
```
```
 
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   /* If we reach here then x is greater than the last element of the array,  return -1 in this case */

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   return -1;
```
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}
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```
 
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int main()
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{
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    int arr[] = {1, 2, 8, 10, 10, 12, 19};

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    int n = sizeof(arr)/sizeof(arr[0]);
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    int x = 3;
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    int index = ceilSearch(arr, 0, n-1, x);

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    if (index == -1)
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        printf("Ceiling of %d doesn't exist in array ", x);

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    else
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        printf("ceiling of %d is %d", x, arr[index]);

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    getchar();
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    return 0;
```
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}
```

$ cc pgm99.c
$ a.out
ceiling of 3 is 8

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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If you wish to look at other example programs on Arrays, go to C Programming Examples on Arrays. If you wish to look at programming examples on all topics, go to C Programming Examples.

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