char input[81];    //holds a string as long as 80 characters 
char *iptr=input;  //also could have done this: char *iptr=&input[0];
gets(iptr);       //makes sure that iptr points to the string typed by the user.

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int main(void) {
  char letters[50];
  char userInit;
  int ctr,n1,numInits=0;
  for(ctr=0;ctr<50;ctr++){
    letters[ctr]=65+(rand()%26);
  }
  printf("What is your first initial?\n");
  userInit=getchar();
  n1=getchar();
  for(ctr=0;ctr<50;ctr++){
    if(letters[ctr]==userInit){
      numInits++;
    }
  }
  printf("\nIn the array, there were %d of your initials.\n", numInits);
  return 0;
}

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#include<math.h> po2=pow(2.0,2.0); printf("2 raised to the 2nd power is %.0f\n", po2); s2=sqrt(49); printf("The square root of 49 is %.0f\n", s2); si628=sin(6.28); print("The sine of 6.28 is %f\n", si628); r01=rand(); printf("A random number from 1 to 32767 is %f\n", r01);

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`int main(){
int age, intSize;
float gift;
printf(“How old are you?\n”);
scanf(“ %d”, age);
if (age<18)
gift=5.00;
else
gift=10.00;

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