c语言问题 无法运行

Question

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


int main(void){
    int size = 2;
    float* ptr;
    float  t;
    int count = 0;

    ptr = calloc(size, sizeof(float)); // dynamic memory allocation for an array to intial size of 5
    while(1){  
        if(t == -100.0)             // While loop repeats till a value of -100.0 is entered
            break;
        if(count == size){
            size *= 2;
            ptr = realloc(ptr, size * sizeof(float));   // reallocation of memory to array by double the size
        }
        scanf("%f", &t);
        ptr[count] = t;
        count++;            // counting array elements
    }
  printf("You have entered the following temperatures : ");
    for(int i=0; i<count-1; i++){
        printf("%.1lf ", ptr[i]);               // printing temperature values
    }
    printf("\nTemperatures in reverse order : ");
    for(int i = count-2; i>=0; i--){
        printf("%.1f\t", ptr[i]);           // printing temperature values in reverse
    }
    free(ptr);
    return 0;
}

Answer 1

一个是t没有初始化，二是ptr需要强制类型转换一下。代码修改如下，如有帮助，请采纳一下，谢谢。

#include<stdio.h>
#include<stdlib.h>
int main(void){
	int size = 2;
	float* ptr;
	float  t = 0.0;
	int count = 0;
	ptr = (float*)calloc(size, sizeof(float)); // dynamic memory allocation for an array to intial size of 5
	while(1){  
		if(t == -100.0)             // While loop repeats till a value of -100.0 is entered
			break;
		if(count == size){
			size *= 2;
			ptr = (float*)realloc(ptr, size * sizeof(float));   // reallocation of memory to array by double the size
		}
		scanf("%f", &t);
		ptr[count] = t;
		count++;            // counting array elements
	}
	printf("You have entered the following temperatures : ");
	for(int i=0; i<count-1; i++){
		printf("%.1lf ", ptr[i]);               // printing temperature values
	}
	printf("\nTemperatures in reverse order : ");
	for(int i = count-2; i>=0; i--){
		printf("%.1f\t", ptr[i]);           // printing temperature values in reverse
	}
	free(ptr);
	return 0;
}