How do you convert strings to numbers in C?

C is a block-structured language. Blocks are delimited by { and}. Every block can have its own local variables. Blocks can be defined wherever a C statement could be used. No semi-colon is required after the closing brace of a block.

Code:

#include<stdio.h>
#define semicolon ;
void main() 
{
 
  int a = 5;
  printf("\n%d", a);
  
  {
  int  a = 2;
  printf("\n%d", a);
  }
 
	
}

Output:

5
2Press any key to continue . . .

Reference to a variable will be to the variable of that name in the nearest enclosing block.

#include
int main(void)
{
 switch(printf("Hello World 
"));
} 

#include
int main(void)
{
 switch(printf("Hello World 
")){}
} 

Hello World
Press any key to continue . . .

#include
int main(void)
{
 switch(printf("Hello World 
"));
} 

#include
int main(void)
{
 switch(printf("Hello World 
")){}
} 

Hello World
Press any key to continue . . .

code

#include
#define semicolon ;
void main()
{
 printf("Hello World 
")semicolon
}

code

Hello World
Press any key to continue . . .

int miles, yards; /* global variables */
main()
{
float kilometres; /* local variables */