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MissingNumInArray.java

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//in a given integer array, this program finds the missing numberin array

public class MissingNumInArray {

public static void main(String[] args) {

int arr[]={1,5,4,3,2,6,7,10,8};

System.out.println(MissNum(arr));

}

public static int MissNum(int arr[]){

int n=arr.length;

int total=((n+1)*(n+2))/2;

int currSum=0;

for(int i=0;i<n;i++) {

currSum+=arr[i];

}

return total-currSum;

}

}