Define and use global variable and function

#include <stdio.h>

int i =0;    //Global variable

void f1(void) {
    int k; // local variable for f1.
    i = 50;
}


main() {
 
     int j;  // local variable in main
     
     f1();    
     
     i =0;
     
     printf(" i in main %d\n",i);

     f1();
     
     printf(" i after call%d\n",i);
}

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Define and use global variable and function : Variable Scope « Language Basics « C / ANSI-C

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