Assume a=10, b=23.5, please solve a+b, a-b, a*b, a/b? Assume: a=3，b=4，c=5, please solve a==b!=c and a!=b==c 用C语言写出来

以下是使用C语言解决这些问题的代码示例：

1. 解决a+b, a-b, a*b, a/b：

#include <stdio.h>

int main() {
    int a = 10;
    float b = 23.5;
    
    printf("a + b = %f\n", a + b);
    printf("a - b = %f\n", a - b);
    printf("a * b = %f\n", a * b);
    printf("a / b = %f\n", a / b);
    
    return 0;
}

2. 解决a==b!=c和a!=b==c：

#include <stdio.h>

int main() {
    int a = 3;
    int b = 4;
    int c = 5;
    
    if (a == b && b != c) {
        printf("a == b != c\n");
    } else if (a != b && b == c) {
        printf("a != b == c\n");
    } else {
        printf("Neither a == b != c nor a != b == c\n");
    }
    
    return 0;
}