Question:C program to print hello world using switch
#include<stdio.h>
void main(){
switch(printf("Hello world")){
}
}Sample Output
Hello worldQuestion:How do you write a program which produces its own source code as its output in c language?
#include<stdio.h>
int main(){
FILE *fp;
char c;
fp = fopen(__FILE__,"r");
do{
c= getc(fp);
putchar(c);
}
while(c!=EOF);
fclose(fp);
return 0;
}Question:Write a c program to reverse a given number
#include<stdio.h>
int main(){
int num,r,reverse=0;
printf("Enter any number: ");
scanf("%d",&num);
while(num){
r=num%10;
reverse=reverse*10+r;
num=num/10;
}
printf("Reversed of number: %d",reverse);
return 0;
}Sample output:
Enter any number: 12
Reversed of number: 21Question:Reverse very large or big numbers beyond the range of long int
#include<stdio.h>
#define MAX 1000
int main(){
char num[MAX];
int i=0,j,flag=0;
printf("Enter any positive integer: ");
scanf("%s",num);
while(num[i]){
if(num[i] < 48 || num[i] > 57){
printf("Invalid integer number");
return 0;
}
i++;
}
printf("Reverse: ");
for(j=i-1;j>=0;j--)
if(flag==0 && num[j] ==48){
}
else{
printf("%c",num[j]);
flag =1;
}
return 0;Sample output:
Enter any positive integer: 234561000045645679001237800000000000
Reverse: 8732100976546540000165432Question:C program to reverse a number using for loop
#include<stdio.h>
int main(){
int num,r,reverse=0;
printf("Enter any number: ");
scanf("%d",&num);
for(;num!=0;num=num/10){
r=num%10;
reverse=reverse*10+r;
}
printf("Reversed of number: %d",reverse);
return 0;
}Sample output:
Enter any number: 123
Reversed of number: 321