c语言输入参数是一个正整数，输出该整数所对应的二进制数对应的字符串。

好的，您可以使用以下的 C 语言代码实现该功能：

#include <stdio.h>
#include <stdlib.h>

char *int_to_binary_string(unsigned int num) {
    char *bin_str = malloc(33 * sizeof(char)); // Allocating memory for the binary string
    if (bin_str == NULL) {
        fprintf(stderr, "Failed to allocate memory!\n");
        exit(1);
    }
    bin_str[32] = '\0'; // Setting NULL terminator

    // Calculating binary string
    for (int i = 31; i >= 0; i--) {
        bin_str[i] = (num & 1) ? '1' : '0'; // Extracting bit and converting to character
        num >>= 1; // Shifting number to right by one bit
    }

    return bin_str;
}

int main() {
    unsigned int num;
    printf("Enter a positive integer: ");
    scanf("%u", &num);

    char *bin_str = int_to_binary_string(num);
    printf("Binary representation: %s\n", bin_str);

    free(bin_str); // Freeing memory allocated for binary string

    return 0;
}

此代码会提示输入一个正整数，然后输出它的二进制表示。