Array in C

We need to declare the array by saying data type of the array.
Each element of the array is of a particular data type. We can’t mix different data types in an array.
Elements in an array stored in contiguous memory locations

Declaring array

int num[5];
int num1[]={9,8,7,6,5};
int num2[5]={19,34,21,55,41};
float percentage[4]={12.4,13.2,15.6,8.3};

Displaying elements of array

First element of an array is stored at 0th position.
int i;
for(i=0;i<5;i++){
 printf(" %d Number = %d \n",i,num[i]);
}
Displaying float variable
for(i=0;i<4;i++){
 printf(" %d Number = %f \n",i,percentage[i]);
}

Char Array

Strings are known as character array.
Declaring char array.
char name[10]="plus2net";
Example
char name[]={'p','l','u','s','2','n','e','t','\0'};

int i=0;
while(name[i]!='\0'){
printf("%c ",name[i]);
i=i+1;
}
Output
p l u s 2 n e t

Asking user to input elements of an array

User will be asked to enter one by one number till 5th number is entered.
#include <stdio.h>
int main(void){
int num[5];
int i;
for(i=0;i<=4;i++){
printf("enter one number \n");
scanf("%d",&num[i]);
}
return 0;
}
Search for element after entering the data by user
#include <stdio.h>
int main(void){
int num[5];
int i;
int x;
int flag=0;
for(i=0;i<=4;i++){
printf("enter one number \n");
scanf("%d",&num[i]);
}

printf("Entry is over, now enter one number to search \n");
scanf("%d",&x);

for(i=0;i<=4;i++){
if(num[i]==x){
        flag=1;
 printf("The number is found = %d \n",num[i]);
}
}
if(flag !=1){
 printf("Number is not found");
}

return 0;
}

Sum and average values of elements of an array

#include <stdio.h>
int main(void){
float sum,avg,num[5];
int i;
//float avg;
for(i=0;i<=4;i++){
printf("enter one number \n");
scanf("%f",&num[i]);
sum=sum+num[i];
}
printf("Sum = %f \n",sum);
avg=sum/5;
printf("Average  = %f \n",avg);

return 0;
}
Output is here
enter one number
3
enter one number
6
enter one number
2
enter one number
8
enter one number
10
Sum = 29.000000
Average  = 5.800000

Highest and lowest number in an array

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

Two dimensional Array in C
  1. Ask for user inputs and store them in an array
  2. Display all elements of an array.
  3. Display only even number elements of an array.
  4. Display the sum of all elements of the array.
  5. Display the highest number of the array.
  6. Display the highest and lowest number of the array
  7. Ask for user inputs to create the array and display the array in reverse order
  8. Find out all duplicate elements of an array
  9. Find out the number of duplicate elements of an array
  10. Find out all unique elements of an array
  11. Copy one array to other
  12. Sort the array in descending order
  13. Sort the array in ascending order
  14. Find out the frequency of occurrance of the elements in an array
Solutions

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