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Write a program to check if a number is prime or not.

 //program to check if a number is prime or not. //number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7) // 0 and 1 are not prime numbers. // 2 is the only even prime number. #include<stdio.h> int main() {     int n , a;          printf("enter any number\n");          scanf("%d", &n);          for(int i=1; i<=n; i++){ /*for loop is executed until the i value is equal to i*/ if(i%n==0){ a++; /* a will get increment if  i%n=0 */ } } if(a==2){ printf("n is a prime number"); }          else{         printf("n is not a prime number"); }          return 0; } output : enter any number 5 n is not a prime number -------------------------------- Process exited after 8.33 seconds with return value 0 Press any key to continue . .
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Program to calculate simple interest in C

/*calculation of simple interest*/ #include<stdio.h>   /*#include is a preprocessor directive and #include<stdio.h> is a declaration for printf() function*/ int main()              /*main() is a function or a cointainer for a set of statements*/ { int p,n;       /*declaration*/ float r,si;    /*declaration*/ p=50000;        //p=principal n=10;             //n=number of years r=2500;         //r=rate    si=p*n*r/100;    //using formula for simple interest        printf("%f\n",si);  /*printf() displays output on the screen, %f is used to print real value, and \n takes cursor to next line*/    return 0;        /*as we are using int before main(), it return a value 0*/   } In the above program, Every time we run the program we...
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write a program (keep taking numbers as input from user until user enters an Odd number)

 //keep taking numbers as input from user until user enters an Odd number #include<stdio.h> int main() { int n; do{ printf("enter any number="); scanf("%d", &n); printf("%d\n", n); if(n % 2 !=0){ break; } } while(1); printf("you have entered an odd number "); return 0; } output : enter any number=0 0 enter any number=8 8 enter any number=6 6 enter any number=4 4 enter any number=2 2 enter any number=3 3 you have entered an odd number -------------------------------- Process exited after 11.81 seconds with return value 0 Press any key to continue . . .
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