C Exercises: Find the integer that appears the least often
C Basic-II: Exercise-1 with Solution
Write a C program that takes n number of positive integers. Find the integer that appears the least number of times among the said integers. If there are multiple such integers, select the smallest one.
Sample Date:
(1,2,3) -> 1
(10, 20, 4, 5, 11) -> 4
C Code:
#include <stdio.h>
int ctr[101];
int num;
int main()
{
int i,x,min_num,result;
printf("What is the number of integers you wish to input? ");
scanf("%d",&num);
printf("Input the number(s):\n");
for(i=0;i<num;i++)
{
scanf("%d",&x);
ctr[x]++;
}
min_num = 100;
for(i=1;i<=100;i++)
{
if( ctr[i]>0 && ctr[i]<min_num)
{ result=i;
min_num=ctr[i];
}
}
printf("Smallest among the said integers: %d\n",result);
}
Sample Output:
What is the number of integers you wish to input? 3 Input the number(s): 1 2 3 Smallest among the said integers: 1
Flowchart:

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C Programming: Tips of the Day
Reading a string with scanf :
An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same place.
Then scanf, when processing the tail of its argument list, will try to pull out a char *. That's the Right Thing when you've passed in string or &string[0], but when you've passed in &string you're depending on something that the language standard doesn't guarantee, namely that the pointers &string and &string[0] -- pointers to objects of different types and sizes that start at the same place -- are represented the same way.
Ref : https://bit.ly/3pdEk6f
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