Code:
#include stdio.h
#include stdlib.h
void main()
{
int num1, num2, i, j, flag, temp, count = 0;
printf("Enter the value of num1 and num2 \n");
scanf("%d %d", &num1, &num2);
if (num2 < 2)
{
printf("There are no primes upto %d\n", num2);
exit(0);
}
printf("Prime numbers are \n");
temp = num1;
if ( num1 % 2 == 0)
{
num1++;
}
for (i = num1; i <= num2; i = i + 2)
{
flag = 0;
for (j = 2; j <= i / 2; j++)
{
if ((i % j) == 0)
{
flag = 1;
break;
}
}
if (flag == 0)
{
printf("%d\n", i);
count++;
}
}
printf("Number of primes between %d & %d = %d\n", temp, num2, count);
}
Output:
Case:1
Enter the value of num1 and num2
70 85
Prime numbers are
71
73
79
83
Number of primes between 70 and 85 = 4
Case:2
Enter the value of num1 and num2
0 1
There are no primes upto 1
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