# Equality and relational expressions.

Write an expression that will cause “Dollar or less” to print if the value of numCents is less than or equal to 100.

```#include <stdio.h>

int main(void) {
int numCents;

scanf("%d", &numCents); // Program will be tested with values: 99, 100, 101, 102.

if (numCents <= 100) {
printf("Dollar or less\n");
}
else {
printf("More than a dollar\n");
}

return 0;
}```

Write an expression that will cause “less or equal to -10” to print if the value of userNum is less than or equal to -10.

```#include <stdio.h>

int main(void) {
int userNum;

scanf("%d", &userNum); // Program will be tested with values: -8, -9, -10, -11.

if (userNum <= -10) {
printf("less or equal to -10\n");
}
else {
printf("more than -10\n");
}

return 0;
}```

Complete the expression so that userPoints is assigned with 0 if userItems is greater than 30 (second branch). Otherwise, userPoints is assigned with 10 (first branch).

The <= operator can be used to evaluate if userItems is greater than 30. The expression should evaluate to false so that the second branch executes and assigns userPoints with 0

```#include <stdio.h>

int main(void) {
int userItems;
int userPoints;

scanf("%d", &userItems); // Program will be tested with values: 15, 20, 25, 30, 35.
userPoints = 0;

if (userItems <= 30) {
userPoints = 10;
}
else {
userPoints = 0;
}

printf("%d\n", userPoints);

return 0;
}```

## If-else statement: Fix errors..

Find and fix the error in the if-else statement…

fix

```#include <stdio.h>

int main(void) {
int userNum;

scanf("%d", &userNum); // Program will be tested with values: 1, 2, 3, 4.

if (userNum = 2) {
printf("Num is less or equal to two\n");
}
else {
printf("Num is greater than two\n");
}

return 0;
}```

solution

```#include <stdio.h>

int main(void) {
int userNum;

scanf("%d", &userNum); // Program will be tested with values: 1, 2, 3, 4.

if (userNum <= 2) { //needed the less than symbol
printf("Num is less or equal to two\n");
}
else {
printf("Num is greater than two\n");
}

return 0;
}```

## If-else statement: Print senior citizen.

```#include <stdio.h>

int main(void) {
int patronAge;

patronAge = 55;

if (patronAge >= 55){
printf("Senior citizen\n");
}
else {
printf("Not senior citizen\n");
}

return 0;
}```