/*
Flow of for-loop
1. init
2. condition
3. block stmt
4. inc/dec/looping part
5. repeats 2 to 4 until condition gets false
Arrays:
Collection of similar data items
include <stdio.h>
int main()
{
int n; scanf("%d",&n);
int a[n];
//input
for(int i=0 ; i<n ; scanf("%d",&a[i++]));
//output
for(int i=0 ; i<n ; printf("%d ",a[i++]));
}
2d array
#include <stdio.h>
int main()
{
int n; scanf("%d",&n);
int a[n][n];
//input
for(int i=0;i<n;i++)//rows
for(int j=0;j<n;j++)//colmns
scanf("%d",&a[i][j]);
//output
for(int i=0;i<n;i++,printf("\n"))//rows
for(int j=0;j<n;printf("%d ",a[i][j++]));//colmns
Move zeros
soln 1:
#include <stdio.h>
int main()
{
int n; scanf("%d",&n);
int a[n];
//input
for(int i=0;i<n;scanf("%d",&a[i++]));
int c = 0;
for(int i=0;i<n;i++)
if(a[i]!=0)
printf("%d ",a[i]);
else
c++;
for(int i=0;i<c;printf("0 "),i++);
}
}
fIND LEADERS:
#include<stdio.h>
int main(){
int n; scanf("%d",&n);
int a[n],sum = 0;
//input
for(int i=0 ; i<n ; scanf("%d",&a[i++]));
for(int i=0;i<n;i++)//outer
{
int l=1;
for(int j=i+1;j<n;j++)//inner
if(a[i]<a[j]){
l = 0;
break;
}
if(l==1) sum+=a[i];
}
printf("%d",sum);
}
IP:4
1
1
1
1
222
222
222
33333
33333
4444444
soln:
Move zeros
IP:
10
1 2 0 4 5 0 6 3 0 7
OP:
1 2 4 5 6 3 7 0 0 0
Find the sum of leaders of given array, The element is a leader when it is higher than all of it's right hand side elements
IP:
10
57 66 64 50 58 65 31 23 35 33
OP:
199
#include<stdio.h>
int main(){
int n; scanf("%d",&n);
for(int i=1;i<=n;i++)
for(int x = n-(i-1);x!=0;x--,printf("\n"))
for(int j = 1;j<=(i*2)-1;printf("%d",i),j++);
}
#include<stdio.h>
int main(){
int n; scanf("%d",&n);
for(int i=0;i<n;i++,printf("\n")){//row
for(int s = (n-1)-i; s>0; s--)//space
printf(" ");
for(int j=0;j<=(i*2);j++){//stars
printf("*");
}
}
}
IP:
4
Output:
*
***
*****
*******
#include<stdio.h>
int main(){
int n; scanf("%d",&n);
int m = n-1;
//upper part
for(int i=0;i<n;i++,printf("\n")){//row
for(int j=0;j<(n*2)-1;j++){//stars
printf(j>=m-i && j<=m+i?"*":" ");
}
}
//lower part
for(int i=n-2;i>=0;i--,printf("\n")){//row
for(int j=0;j<(n*2)-1;j++){//stars
printf(j>=m-i && j<=m+i?"*":" ");
}
}
}
IP:4
Output:
*
***
*****
*******
*****
***
*
*/
#include<stdio.h>
int main(){
int n; scanf("%d",&n);
int m = n-1,x = (n*2)-2;
for(int i=0;i<(n*2)-1;i++,printf("\n")){//row
for(int j=0;j<(n*2)-1;j++){//stars
int min = (i<x-i)?i:x-i;
printf(j>=m-min && j<=m+min?"*":" ");
}
}
} Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!
OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.
#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
scanf("%s", name);
printf("Hello %s \n" , name );
return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}