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C Program Hello World

/*Write a Program to display “Hello World” on the screen.*/

 #include <stdio.h>

 int main(void) {
printf("Hello World");
return 0;
}

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C Program Upper to Lower and Lower to Upper Case

/*  Write a C Program to Conver all Character of String from upper to lower and lower to upper case.  */ #include <stdio.h> int main(void)  { char str[20]="aBcDeF"; int i=0; while(str[i]!='\0') { str[i]=str[i]^32;                 //Above Logic will convert character upper to Lower and lower to upper i++; } printf("Changed String : %s",str); return 0; }
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