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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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Write a program to print the grades to a student.

 //program to print the grades to a student. //marks < 35 is C //35 <= marks < 70 is B //70 <= marks < 90 is A //90 <= marks <=100 is A+ #include<stdio.h> #include<math.h> int main() { int marks; printf("enter marks(0-100)\n"); scanf("%d", &marks); if(marks <35 ){ printf("grade C\n"); } else if(marks >= 35 && marks < 70){ printf("grade B\n"); } else if(marks >=70 && marks < 90){ printf("grade A\n"); } else if(marks >=90 && marks <= 100){ printf("grade A+\n"); } else{ printf("invalid marks"); } return 0; } Output : enter marks(0-100) 27 grade C -------------------------------- Process exited after 9.762 seconds with return value 0 Press any key to continue . . . enter marks(0-100) 68 grade B -------------------------------- Process exited after 5.493 seconds with return value 0
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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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