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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4.  
  5. float str_to_float(char *);
  6. void float_to_str(float,char *);
  7.  
  8. int main(){
  9. 	int max_size;
  10. 	float x;
  11. 	char *arr;
  12. 	printf("Enter max size of string : ");
  13. 	scanf("%d",&max_size);
  14. 	arr=malloc((max_size+1)*sizeof(char));
  15. 	scanf("%s",arr);
  16. 	x=str_to_float(arr);
  17. 	printf("%f\n%f",x,atof(arr));
  18. 	return 0;
  19. }
  20.  
  21. float str_to_float(char *arr){
  22. 	int i,j,flag;
  23. 	float val;
  24. 	char c;
  25. 	i=0;
  26. 	j=0;
  27. 	val=0;
  28. 	flag=0;
  29. 	while ((c = *(arr+i))!='\0'){
  30. //		if ((c<'0')||(c>'9')) return 0;
  31. 		if (c!='.'){
  32. 			val =(val*10)+(c-'0');
  33. 			if (flag == 1){
  34. 				--j;
  35. 			}
  36. 		}
  37. 		if (c=='.'){ if (flag == 1) return 0; flag=1;}
  38. 		++i;
  39. 	}
  40.     val = val*pow(10,j);
  41. 	return val;
  42. }
Success #stdin #stdout 0s 9424KB
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stdin
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23
1236.965
stdout
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Enter max size of string : 1236.964966
1236.965000
https://ideone.com/e6i8M0
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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