해달 채점 - c

c/1.c

@@ -6,22 +6,20 @@
 #include <stdio.h>
 
 int main() {
-    int num, re = 0; 
+   int num, reversedNum = 0;
 
+
+    printf("입력\n");
     scanf("%d", &num);
+
 
-    int len= 3;
-    while(num != 0) {
-        int ten = 1;
-        for(int i = 0; i < len-1 ; i++){
-            ten *= 10;
-        }
-        re += ten * (num % 10);
-        num /= 10;
-        len--;
+    while (num != 0) {
+        reversedNum = reversedNum * 10;       
+        reversedNum = reversedNum + num % 10; 
+        num = num / 10;                      
     }
+    printf("출력\n%d", reversedNum);
 
-    printf("%d", re);
 
     return 0;
 }

c/2.c

@@ -7,18 +7,15 @@
 
 int main() {
 
-    int a=0;
+    int age;
 
-    scanf("%d", &a);
+    printf("나이를 입력하세요: ");
+    scanf("%d", &age);
 
-    if(a>=61){
+    if (age >= 61) {
         printf("DISCOUNT\n");
-        printf("BOARD");
-    }
-
-    else{
-        printf("BOARD");
     }
+    printf("BOARD\n");
 
     return 0;
 }

c/3.c

@@ -6,17 +6,16 @@
 #include <stdio.h>
 
 int main() {
-   int i=0;
+   int hour;
 
-   scanf("%d", &i);
+    printf("시간을 입력해주세요 (0-23): ");
+    scanf("%d", &hour);
 
-   if(i<12){
-    printf("AM");
-   }
-
-   else{
-    printf("PM");
-   }
+    if (hour < 12) {
+        printf("AM\n");
+    } else {
+        printf("PM\n");
+    }
 
     return 0;
 }

c/4.c

@@ -6,28 +6,20 @@
 #include <stdio.h>
 
 int main() {
-    int i;
-
-    scanf("%d", &i);
-
-    if(i>=90 && i<=100){
-        printf("A");
-    }
-
-    else if(i<90 && i>=80){
-        printf("B");
-    }
-
-    else if(i<80 && i>=70){
-        printf("C");
-    }
-
-    else if(i<70 && i>=60){
-        printf("D");
+    int score;
+
+    scanf("%d", &score);
+
+    if (score >= 90) {
+        printf("A\n");
+    } else if (score >= 80) {
+        printf("B\n");
+    } else if (score >= 70) {
+        printf("C\n");
+    } else if (score >= 60) {
+        printf("D\n");
+    } else {
+        printf("F\n");
     }
-    else{
-        printf("F");
-    }
-
     return 0;
 }

c/5.c

@@ -6,19 +6,16 @@
 #include <stdio.h>
 
 int main() {
-    int age, height;
+     int age, height;
 
-    scanf("%d",&age);
-    scanf("%d",&height);
+    scanf("%d %d", &age, &height);
 
-    if(age>=14 || height>=160){
-        printf("X");
+    if (age >= 14 || height >= 160) {
+        printf("X\n");
+    } else {
+        printf("O\n");
     }
 
-    else
-    {
-        printf("O");
-    }
 
     return 0;
 }

c/6.c

@@ -6,16 +6,18 @@
 #include <stdio.h>
 
 int main() {
-    char c;
+    char ch;
 
-    scanf("%c", &c);
+    printf("Enter a character: ");
+    scanf(" %c", &ch);
 
-    if(c=='a' || c=='e' || c=='i' || c=='o' || c=='u' ){
-        printf("O");
+
+    if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' ||
+        ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') {
+        printf("O\n");
+    } else { 
+        printf("X\n");
     }
 
-    else{
-        printf("X");
-    }
     return 0;
 }

c/7.c

@@ -8,34 +8,26 @@
 int main() {
    int year, month;
 
-
-    scanf("%d", &year);
-    scanf("%d", &month);
+    scanf("%d %d", &year, &month);
 
-
-    int isLeapYear = 0; 
-    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
-        isLeapYear = 1; 
-    }
+    int isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
 
     switch (month) {
         case 2: 
             if (isLeapYear) {
-                printf("29");
+                printf("29\n");
             } else {
-                printf("28");
+                printf("28\n");
             }
             break;
-        case 4:
+        case 4: 
         case 6:
         case 9:
-        case 11:
-            printf("30"); 
-            break;
-        default:
-            printf("31"); 
+        case 11: 
+            printf("30\n");
             break;
+        default: 
+            printf("31\n");
     }
-
     return 0;
 }

c/8.c

@@ -10,14 +10,21 @@ int main() {
 
     scanf("%d", &n);
 
-    for(int i = 1; i <= n; i++) {
-        sum += i; 
-        factorial *= i; 
+    for (int i = 1; i <= n; i++) {
+        sum += i;  
+        factorial *= i;  
+    }
+
+    if (n == 0) {
+        factorial = 1;
     }
 
     printf("%d\n", sum);
     printf("%d", factorial);
-
+    for (int i = 2; i <= n; i++) {
+        printf(" * %d", i);
+    }
+    printf(")\n");
 
     return 0;
 }

c/9.c

@@ -22,6 +22,7 @@ int main() {
         } else {
             printf("X\n");
         }
+
     }
 
 }