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SCOPE.C
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1989-11-10
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2KB
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67 lines
/* Chapter 5 - Program 4 */
#include "stdio.h" /* Prototypes for Input/Output */
void head1(void); /* Prototype for head1 */
void head2(void); /* Prototype for head2 */
void head3(void); /* Prototype for head3 */
int count; /* This is a global variable */
void main()
{
register int index; /* This variable is available only in main */
head1();
head2();
head3();
/* main "for" loop of this program */
for (index = 8;index > 0;index--) {
int stuff; /* This variable is only available in these braces*/
for (stuff = 0;stuff <= 6;stuff++)
printf("%d ",stuff);
printf(" index is now %d\n",index);
}
}
int counter; /* This is available from this point on */
void head1(void)
{
int index; /* This variable is available only in head1 */
index = 23;
printf("The header1 value is %d\n",index);
}
void head2(void)
{
int count; /* This variable is available only in head2 */
/* and it displaces the global of the same name */
count = 53;
printf("The header2 value is %d\n",count);
counter = 77;
}
void head3(void)
{
printf("The header3 value is %d\n",counter);
}
/* Result of execution
The header1 value is 23
The header2 value is 53
The header3 value is 77
0 1 2 3 4 5 6 index is now 8
0 1 2 3 4 5 6 index is now 7
0 1 2 3 4 5 6 index is now 6
0 1 2 3 4 5 6 index is now 5
0 1 2 3 4 5 6 index is now 4
0 1 2 3 4 5 6 index is now 3
0 1 2 3 4 5 6 index is now 2
0 1 2 3 4 5 6 index is now 1
*/