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  1. #include<bits/stdc++.h>
  2. //Phan thanh Nhàn 
  3. using namespace std;
  4. #define MAXN 512
  5. void c4a(const char* input,const char* output){
  6. 	FILE* f1=fopen(input,"r"),*f2=fopen(output,"w");
  7. 	if(!f1||!f2)	return;
  8. 	char tmp[MAXN];
  9. 	while(fgets(tmp,sizeof(tmp),f1)){//Phan thnah nhan
  10. 		int len=strlen(tmp);
  11. 		if(len>0&&tmp[len-1]=='\n')
  12. 			tmp[len-1]='\0';
  13. 		int k=strchr(tmp,' ')-tmp;
  14. 		tmp[k]='\0';
  15. 		fprintf(f2,"%s \n",tmp);
  16. 	}
  17. 	fclose(f1);
  18. 	fclose(f2);
  19. }
  20. void c4b(const char* input,const char* output){
  21. 	FILE* f1=fopen(input,"r"),*f2=fopen(output,"a");
  22. 	if(!f1||!f2)	return;
  23. 	int max=0;
  24. 	char tmp[MAXN];char ans[MAXN];
  25. 	while(fgets(tmp,sizeof(tmp),f1)){
  26. 		int len=strlen(tmp);
  27. 		if(len>0&&tmp[len-1]=='\n')
  28. 			tmp[len-1]='\0';
  29. 		if(strlen(tmp)>max){
  30. 			max=strlen(tmp);
  31. 			strcpy(ans,tmp);
  32. 		}		
  33. 	}
  34. 	fprintf(f2,"%s ",ans);
  35.  
  36. 	fclose(f1);fclose(f2);
  37. }
  38.  
  39.  
  40. int main(){
  41. 	const char* input="str_input.txt";
  42. 	const char* output="str_output.txt";
  43. 	c4a(input,output);
  44. 	c4b(input,output);
  45.  
  46.  
  47. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/ck5XBK
language:
C++14 (gcc 8.3)
created:
281 days ago
visibility:
public

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