Max function
#include <stdio.h>
int main()
{
int x, y;
scanf("%d%d", &x, &y);
printf("max = %d\n", max(x, y));
return 0;
}
Max functionvoid max(int a, int b)
{
if (a > b)
{
printf("%d > %d\n", a, b);
return ;
}
if (b > a)
{
printf("%d > %d\n", b, a);
return ;
}
printf("%d = %d\n", a, b);
}
Max function void max(int a, int b)
{
if (a > b)
printf("%d > %d\n", a, b);
else if (b > a)
printf("%d > %d\n", b, a);
else
printf("%d = %d\n", a, b);
}
Triangle area
double triangle_area(double width, double height)
{
double area = width * height / 2;
return area;
}
messagesvoid messages(int i){ switch(i) {
case 0 : printf("first message\n"); break; case 1 : printf("second message\n"); break; case 2 : printf("third message\n"); }}
power
double power(double x, int y) /* y >= 0 */
{
double res;
for (res = 1; y > 0; y--)
res *= x;
return res;
}
power
double power(double x, int y) /* y >= 0 */
{
double res = 1;
for(; y > 0; y--)
res *= x;
return res;
}
What happens here?void f(int x) { x++;}int main(){
int x = 5; f(); printf(“x = %d\n”, x); return 0;
}
Arrays - Counting
int count(int arr[], int n, int val) {
int i, cnt = 0; for (i = 0; i < n; i++)
if (arr[i] == val) ++cnt;
return cnt;}
Programs#include <stdio.h>#include <stdlib.h>int mult(int, int);int power(int, int);void power_table(int, int);int main(){ int base, power; printf("Enter base and power of the power table :"); if (scanf("%d%d", &base, &power) < 2) { printf("Input Error");
return 1; } power_table(base, power); return 0;}
multint mult(int x, int y) /* returns x*y */{ int res = 0; for (; y > 0; y--) res += x; return res;}
Power tablevoid power_table(int n, int k){ int i, j ; for (i = 1; I <= k; i++)
{ for (j = 1; j <= n; j++)
printf("%-5d",power(j, i)); putchar('\n');}
return ;}
Power
int power(int x, int y) /* returns x to the power of y */
{ int res = 1; for (; y > 0; y--) res = mult(res, x); return res;}
scope#include <stdio.h>
int main()
{
int x = 10, y = 15;
{
int x = 20;
printf(x %d, y = %d\n, x++, y++);
}
printf(x %d, y = %d\n, x, y);
return 0;
}
scope#include <stdio.h>
int main( void )
{
int count = 1;
for ( ; count <= 5; count++)
{
int count = 1;
printf(“%d\n”, count);
}
return 0 ;
}
scope#include <stdio.h>
int main( void )
{
int count = 1;
while (count <= 5)
{
int count = 1;
printf(“%d\n”, count);
count++;
}
return 0 ;
}
scopeint main()
{
int a = 1, b = 2, c = 3;
printf(%3d %3d %3d\n, a, b, c);
{
int b = 4; double c = 5.0; printf(%d %d %f\n, a, b, c);
a b;
{
int c;
c b;
printf(%d %d %d\n, a, b, c); }
printf(%d %d %f\n, a, b, c);
}
printf(%d %d %d\n, a, b, c);
return 0;
}
static#include <stdio.h>
void f(void)
{
static int cnt = 1;
printf(%d , cnt++);
}
int main()
{
int i;
for(i = 0; i < 5; ++i)
f();
for(i = 0; i < 5; ++i)
f();
return 0;
}
globals#include <stdio.h>
int x = 20, y;
void f1(int x)
{
printf(x = %d y = %d\n, x, y);
x = y = 10;
}
void f2(int y)
{
printf(x = %d y = %d\n, x, y);
x = y = 15;
}
int main()
{
y = 5;
f1(20);
f2(y);
printf(x = %d y = %d\n, x, y);
return 0;
}
fun#include <stdio.h>int x = 5, y = 6, z = 7;void printvals(int a, int b, int c, int x, int y ,int z){
printf(a = %d b = %d c = %d x = %d” “ y = %d z = %d, a, b, c, x, y, z);}
void oof(int a, int b, int c){
int x; static int z; printvals(a, b, c, x, y, z); x = a; z = x;
y++; {
int a; a = x; b = y; c = z; printvals(a, b, c, x, y, z);
} printvals(a, b, c, x, y, z);
}
int main(){
int a = 0; x = 1; y = 2; z = 3; oof(7, 8, 9); x++; y++; z++; oof(x, y, z); return 0 ;
}
arrays
#include <stdio.h>
int main( void )
{
int a[3][5];
. . .
return 0 ;
}
<type> <name>[rows][columns] ;
0
1
2
0 1 2 3 4
a[0][0]
a[1][3]
arrays#include <stdio.h>int main( void ){
int a[3][5], i, j; for (i = 0; i < 3; i++)
for (j = 0; j < 5; j++) scanf(%d”, &a[i][j]);
return 0 ;}
0 1 2
0
1
2
0 1 2 3 4
arrays#include <stdio.h>int main( void ){
int a[3][5], i, j; for (j = 0; j < 5; j++)
for (i = 0; i < 3; i++) scanf(%d”, &a[i][j]);
return 0 ;}
0 1 2
0
1
2
0 1 2 3 4
arrays#include <stdio.h>int main( void ){
int a[3][5], j, k, sum = 0 ; for (j = 0; j < 3; j++)
for (k = 0; k < 5; k++) scanf(%d”, &a[j][k]);
for (j = 0; j < 3; j++) for (k = 0; k < 5; k++)
sum += a[j][k]; printf(The sum is : %d\n, sum) ; return 0 ;}
arrays#include <stdio.h>#define N 3int main( void ){
int matrix[N][N], j, k, sum = 0; for (i = 0; i < N; i++)
for (j = 0; j < N; j++) matrix[i][j] = i + j;
for (i = 0; i < N; i++) {
for (j = 0; j < N; j++) printf(%d “, matrix[i][j]);
printf(\n) ; }
return 0;}
typedef
typedef double scalar ;typedef int length;
int main( void ){
double a, b;scalar c, d;int i, j;length k, l;
}
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