C语言练习

#include <stdio.h>
int main() {
    char char_1='A';
    printf("%c,%d",char_1,char_1);
    return 0;
}

 

#include <stdio.h>
int main() {
    char char_1='A';
    int char_A=80;
    char_1=char_A;
    printf("%c",char_1);
    return 0;
}

 

#include <stdio.h>
int main() {
    char char_1='A';
    int char_A=120;
    char_1=char_A;
    printf("%c\n",char_1);
    printf("%zu",sizeof(char_1));
    return 0;
}

 

#include <stdio.h>
double calculate_pi(int terms) {
    double pi = 0.0;
    int i=0;
    for (i = 0;i<terms;i++) {
        double term = (i % 2 == 0)?1.0 : -1.0;
        pi += term / (2 * i + 1);
    }
    pi *= 4; 
    return pi;
}
 
int main() {
    int terms = 1000000; 
    double pi = calculate_pi(terms);
    printf("%f\n", pi);
    return 0;
}