Solutions of CSE122 of Fall-17

//01
//(A)

 1. I am a DIU student
 2. am a DIU student
 3. a
 4. m a DIU student
 5. m
//(B)
 1. I=5 J=3
 4. I=5 J=3
 5. I=6 J=4
 2. I=6 j=3
 3, K=10

//02
//(A)

#include <stdio.h>
int main(){
    int n;

    scanf("%d", &n);

    printf("%d\n", (n * (n + 1)) / 2);

    return 0;
}

//B

#include <stdio.h>
int sum(int a){
    if(a == 0){
        return 0;
    }
    return a + sum(a - 1);
}

int main(){
    int n;

    scanf("%d", &n);

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

    return 0;
}

//C

#include <stdio.h>
int mul(int a, int b, int c){
    return a * b * c;
}

int main(){
    int a, b, c;

    scanf("%d %d %d", &a, &b, &c);

    printf("%d\n", mul(a, b, c));

    return 0;
}

//D

#include <stdio.h>
struct Car{
    char mod_name[500];
    int max_speed;
    double wh_size;
};
int main(){
    struct Car Mercedes;
    struct Car BMW;

    scanf("%s", Mercedes.mod_name);
    scanf("%d %lf", &Mercedes.max_speed, &Mercedes.wh_size);

    scanf("%s", BMW.mod_name);
    scanf("%d %lf", &BMW.max_speed, &BMW.wh_size);

    printf("Mercedes Model Name: %s\n", Mercedes.mod_name);
    printf("Mercedes Maximum Speed: %d kmph\n", Mercedes.max_speed);
    printf("Mercedes Wheel Size: %.1lf inches\n\n", Mercedes.wh_size);


    printf("Mercedes Model Name: %s\n", BMW.mod_name);
    printf("Mercedes Maximum Speed: %d kmph\n", BMW.max_speed);
    printf("Mercedes Wheel Size: %.1lf inches\n", BMW.wh_size);

    return 0;
}


//E

#include <stdio.h>
int main(){
    char str[5000];

    scanf(" %[^\n]", str);
    int len = strlen(str);

    for(int i = len - 1; i >= 0; i--){
        printf("%c", str[i]);
    }
    printf("\n");

    return 0;
}

//F

#include <stdio.h>
int main(){
    int arr[10];
    int temp;

    for(int i = 0; i < 10; i++){
        scanf("%d", &arr[i]);

        if(i != 0 && i % 2 == 1){
            temp = arr[i - 1];
            arr[i - 1] = arr[i];
            arr[i] = temp;
        }
    }

    for(int i = 0; i < 10; i++){
        if(i != 9){
            printf("%d ", arr[i]);
        } else {
            printf("%d\n", arr[i]);
        }
    }

    return 0;
}