Informatics Olympiad 1.2: Sequence structure programming (1)

The first part of C++ language

Chapter 2 Sequence Structure Program Design

The first section of operators and expressions

1006 A+B question

#include <cstdio>
using namespace std;

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    printf("%d\n", a + b);

    return 0;
}

#####1007 Calculate the value of (a+b)×c

#include <cstdio>
using namespace std;

int main() {
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    printf("%d\n", (a + b) * c);

    return 0;
}

1008 Calculate the value of (a+b)/c

#include <cstdio>
using namespace std;

int main() {
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    printf("%d\n", (a + b) / c);

    return 0;
}

1009 Division with remainder

#include <cstdio>
using namespace std;

int main() {
    int a, b;
    scanf("%d %d %d", &a, &b);
    printf("%d %d\n", a / b, a % b);

    return 0;
}

1010 Calculate the floating point value of the score

#include <cstdio>
using namespace std;

int main() {
    int a, b;
    scanf("%d %d %d", &a, &b);
    printf("%.9lf\n", 1.0 * a / b);

    return 0;
}

Section 2 Constants and Variables

1011 Mortality rate from influenza A epidemic

#include <cstdio>
using namespace std;

int main() {
    int a, b;
    scanf("%d %d %d", &a, &b);
    printf("%.3lf%%\n", 100.0 * b / a);

    return 0;
}

1012 Calculate the value of a polynomial

#include <cstdio>
using namespace std;

int main() {
    double x, a, b, c, d;
    scanf("%lf %lf %lf %lf %lf", &x, &a, &b, &c, &d);
    printf("%.7lf\n", a*x*x*x + b*x*x + c*x +d);

    return 0;
}

1013 Temperature expression transformation

#include <cstdio>
using namespace std;

int main() {
    double F, C;
    scanf("%lf", &F);
    C = 5 * (F - 32) / 9;
    printf("%.5lf\n", C);

    return 0;
}

1014 Calculations related to circles

#include <cstdio>
using namespace std;

int main() {
    double r, d, l , s;
    const double pi = 3.14159;
    scanf("%lf", &r);
    d = 2 * r;
    l = 2 * pi * r;
    s = pi * r * r;
    printf("%.4lf %.4lf %.4lf\n", d, l, s);

    return 0;
}

1015 Calculate the resistance of parallel resistors

#include <cstdio>
using namespace std;

int main() {
    double r1, r2, R;
    scanf("%lf %lf", &r1, &r2);
    R = 1.0 / (1.0 / r1 + 1.0 / r2);
    printf("%.2lf\n", R);

    return 0;
}

Section 3 Standard Data Type

1016 Integer data type storage space size

#include <iostream>
using namespace std;

int main() {
    int a;
    short b;

    cout << sizeof(a) << ' ' << sizeof(b) << endl;

    return 0;
}

1017 Floating-point data type storage space size

#include <iostream>
using namespace std;

int main() {
    float a;
    double b;

    cout << sizeof(a) << ' ' << sizeof(b) << endl;

    return 0;
}

1018 Storage space size of other data types

#include <iostream>
using namespace std;

int main() {
    bool a;
    char b;

    cout << sizeof(a) << ' ' << sizeof(b) << endl;

    return 0;
}

1019 Floating point number is rounded towards zero

#include <iostream>
using namespace std;

int main() {
    float a;

    cin >> a;
    cout << (int)a << endl;

    return 0;
}

1020 print ASCII code

#include <cstdio>
using namespace std;

int main() {
    char ch;

    scanf("%c", &ch);
    printf("%d\n", ch);

    return 0;
}

1021 print characters

#include <cstdio>
using namespace std;

int main() {
    int a;

    scanf("%d", &a);
    printf("%c\n", a);

    return 0;
}

1022 Conversion between integer and boolean

#include <cstdio>
using namespace std;

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

    scanf("%d", &a);
    b = a;
    c = b;
    printf("%d\n", c);

    return 0;
}

1023 The size of Hello, World!

#include <iostream>
using namespace std;

int main() {
    cout << sizeof("Hello, World!") << endl;

    return 0;
}

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