https://cs50.harvard.edu/college/psets/1/
1. Hello
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#include <stdio.h>
#include <cs50.h>
int main(void)
{
string name = get_string("What is your name?\n");
printf("hello, %s\n", name);
}
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2a. Mario less
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#include <cs50.h>
#include <stdio.h>
int main(void)
{
int stairs = get_int("Height: ");
while(!(stairs >= 1 && stairs <= 8)) stairs = get_int("Height: ");
for(int i = 0; i < stairs; i++){
for(int j = stairs; j > i + 1; j--){
printf(" ");
}
for(int j = 0; j <= i; j++){
printf("#");
}
printf("\n");
}
}
http://colorscripter.com/info#e" target="_blank" style="color:#e5e5e5text-decoration:none">Colored by Color Scripter
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2b. Mario more
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#include <cs50.h>
#include <stdio.h>
int main(void)
{
int stairs = get_int("Height: ");
while(!(stairs >= 1 && stairs <= 8)) stairs = get_int("Height: ");
for(int i = 0; i < stairs; i++){
for(int j = stairs; j > i + 1; j--){
printf(" ");
}
for(int j = 0; j < i + 1; j++){
printf("#");
}
printf(" ");
for(int j = 0; j < i + 1; j++){
printf("#");
}
/*for(int j = stairs; j > i + 1; j--){
printf(" ");
}*/
printf("\n");
}
}
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3a. Cash
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#include <stdio.h>
#include <math.h>
#include <cs50.h>
int main(void){
float change = get_float("Change owed: ");
while(!(change >= 0.00)) change = get_float("Change owed: ");
int coins = round(change * 100);
int count = 0;
while(coins != 0){
if(coins >= 25){
int temp = coins/25;
coins = coins - (temp * 25);
count += temp;
}
if(coins >= 10){
int temp = coins/10;
coins = coins - (temp * 10);
count += temp;
}
if(coins >= 5){
int temp = coins/5;
coins = coins - (temp * 5);
count += temp;
}
count += coins;
coins = 0;
}
printf("%i\n", count);
}
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3b. Credit
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#include <cs50.h>
#include <stdio.h>
int main(void){
long number = get_long("Number: ");
char *answer = NULL;
if((number/1000000000000 > 1 && (number/1000000000000) % 10 == 4) ||
(number/1000000000000000 > 1 && (number/1000000000000000) % 10 == 4)) {
answer = malloc(5 * sizeof(char));
answer = "VISA";
}
else if((number/100000000000000) > 1 &&
((number/10000000000000) % 100 == 34 || (number/10000000000000) % 100 == 37)){
answer = malloc(5 * sizeof(char));
answer = "AMEX";
}
else if((number/100000000000000) > 1 &&
((number/100000000000000) % 100 >= 51 && (number/100000000000000) % 100 <= 55)) {
answer = malloc(10 * sizeof(char));
answer = "MASTERCARD";
printf("master?\n");
} else {
printf("INVALID\n");
return 0;
}
int forSum = 0;
for(long i = 10; i <= number; i *= 100){
int divNum = ((number % (i * 10))/i) * 2;
if(divNum >= 10){
int temp = divNum % 10;
divNum /= 10;
forSum += temp + divNum;
} else {
forSum += divNum;
}
//printf("%i, %ld forSum, %i\n", forSum, i, divNum);
}
int restSum = 0;
for(long i = 10; i <= number * 10; i *= 100){
int restNum = (number % (i))/(i/10);
restSum += restNum;
//printf("%i, %ld restSum, %i\n", restSum, i, restNum);
}
if((forSum + restSum) % 10 == 0){
printf("%s\n", answer);
} else {
printf("INVALID\n");
}
}
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