Print prime numbers between 1-300 using break and continue in c

Print prime numbers between 1-300 using break and continue in c
#include <math.h>

#include <stdio.h>

main(){

  int i, j;

  i = 2;

  while ( i < 300 ){

     j = 2;

     while ( j < sqrt(i) ){

         if ( i % j == 0 )

            break;

         else{

            ++j;

            continue;

         }

      }

      if ( j > sqrt(i) )

            printf("%d\t", i);

      ++i;

  }

  return 0;

}

Pallindorem string

#include<string.h>

#include<stdio.h>

int main(){

  char *str,*rev;

  int i,j;

  printf("\nEnter a string:");

  scanf("%s",str);

  for(i=strlen(str)-1,j=0;i>=0;i--,j++)

      rev[j]=str[i];

      rev[j]='\0';

  if(strcmp(rev,str))

      printf("\nThe string is not a palindrome");

  else

      printf("\nThe string is a palindrome");

  return 0;

}

Pallindorem string -2 

  #include <stdio.h>

  #include <string.h>

  

  int main()

  {

     char text[100];

     int begin, middle, end, length = 0;

  

    gets(text);

 

     while ( text[length] != '\0' )

        length++;

  

     end = length - 1;

     middle = length/2;

  

     for( begin = 0 ; begin < middle ; begin++ )

     {

        if ( text[begin] != text[end] )

        {

           printf("Not a palindrome.\n");

           break;

        }

        end--;

     }

     if( begin == middle )

        printf("Palindrome.\n");

 

     return 0;

  }

 

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