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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int mystrlen(char s[]){
  5. 	int i;
  6. 	for(i=0;s[i]!='\0';i++){
  7. 		;
  8. 	}
  9. 	return i;
  10. }
  11.  
  12. int main(void){
  13. 	int size,i,j;
  14. 	char s[1024];
  15. 	char *a;
  16. 	scanf("%s",s);
  17. 	size=mystrlen(s);
  18. 	a=(char *)malloc(sizeof(char)*(2*size+1));
  19. 	if(a==NULL){
  20. 		printf("ERROR\n");
  21. 		return 0;
  22. 	}
  23. 	for(i=0;i<size;i++){
  24. 		a[i]=s[i];
  25. 	}
  26. 	for(j=0;j<size;j++){
  27. 		a[size+j]=s[size-j-1];
  28. 	}
  29. 	printf("%s",a);
  30. 	free(a);
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/CGj5Ws
language:
C (gcc 8.3)
created:
16 hours ago
visibility:
public

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