Practice questions with solutions on array

Ask for user inputs and store them in an array

#include <stdio.h>

int main(void){
int num1[5];
int i=0;

for(i=0;i<5;i++){
printf("Enter number : ");
scanf("%d",&num1[i]);
}
return 0;
}

Display all elements of an array.

#include <stdio.h>

int main(void){
int num1[5]={5,3,4,2,9};
int i=0;

for(i=0;i<5;i++){
printf("Number : %d \n",num1[i]);

}
return 0;
}

Display only even number elements of an array.

#include <stdio.h>
int main(void){
int num1[5]={5,3,4,2,9};
int i=0;

for(i=0;i<5;i++){
if(num1[i]%2==0){
printf("Number : %d \n",num1[i]);
}
}

return 0;
}

Display the sum of all elements of the array.

#include <stdio.h>
int main(void){
int num1[5]={5,3,4,2,9};
int i=0,sum=0;

for(i=0;i<5;i++){
sum=sum + num1[i];
}
printf("Sum : %d",sum);
return 0;
}

Display the highest number of the array.

#include <stdio.h>
int main(void){
int num[5]={12,14,11,15,11,10};
//int num[6]={-30,-32,-33,-28,-31,-35};
int hig_num=num[0];
int i;
for(i=0;i<6;i++){
  if(num[i]>hig_num){
    hig_num=num[i];
  }
}
printf("Highest Number is %d",hig_num);
return 0;
}

Display the highest and lowest number of the array

#include <stdio.h>
int main(void){
int num[6]={16,14,9,15,11,10};
//int num[6]={-25,-32,-33,-28,-31,-24};
int hig_num=num[0];
int low_num=num[0];
int i;
for(i=0;i<6;i++){
  if(num[i]>hig_num){
    hig_num=num[i];
  }else if(num[i]<low_num){
    low_num=num[i]; 
  }
}
printf("Highest Number is %d ",hig_num);
printf("\nLowest Number is %d ",low_num);
return 0;
}

Ask for user inputs to create the array and display the array in reverse order

#include <stdio.h>
int main(void){
int num[6];
int i;
for(i=0;i<6;i++){
printf("Enter %d number ",i);
scanf("%d",&num[i]);
}
// display in reverse order //
for(i=5;i>=0;i--){
printf("Position %d  is : %d \n",i,num[i]);
}
return 0;
}

Find out all duplicate elements of an array

Find out the number of duplicate elements of an array

Find out all unique elements of an array

Copy one array to other

Sort the array in descending order

#include <stdio.h>
int main(void){
int num[]={0,14,-11,15,11,-20};
//int num[6]={-30,-32,-33,-28,-31,-35};
int i=0,j=0;
int x=0;
for(i=0;i<6;i++){
for(j=i+1;j<6;j++){
if(num[i]<num[j]){ // descending order 
//if(num[i]>num[j]){ // ascending order 
x=num[i];
num[i]=num[j];
num[j]=x;
}
}
}
//////////
for(i=0;i<6;i++){
printf(" %d \n",num[i]);
}
/////////
return 0;
}

Sort the array in ascending order

Find out the frequency of occurrance of the elements in an array