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#include <stdio.h>
#include <string.h>
 
void p2(unsigned int tmp)
{
    printf("From p2: \n");
    printf("tmp = %d ,In hex tmp = %x\n", tmp, tmp);
}
 
int main()
{
    float fvar = 45.65;
 
    p1(fvar);
    p2(fvar);
    printf("From main:\n");
    printf("sizeof(int) = %lu, sizeof(float) = %lu\n", sizeof(int),
            sizeof(float));
    unsigned int ui;
    memcpy(&ui, &fvar, sizeof(fvar));
    printf("fvar = %x\n", ui);
    return 0;
}
 
void p1(unsigned int tmp)
{
    printf("From p1: \n");
    printf("tmp = %d ,In hex tmp = %x\n", tmp, tmp);
}

prog.c: In function ‘main’:
prog.c:14:5: error: implicit declaration of function ‘p1’ [-Werror=implicit-function-declaration]
     p1(fvar);
     ^~
prog.c: At top level:
prog.c:25:6: error: conflicting types for ‘p1’ [-Werror]
 void p1(unsigned int tmp)
      ^~
prog.c:14:5: note: previous implicit declaration of ‘p1’ was here
     p1(fvar);
     ^~
cc1: all warnings being treated as errors

Standard output is empty