Question

Write a C Program that uses Command Line Arguments to convert the input string at the Command Line into Upper-Case, by traversing the argument at Command Line with the help of pointers.

Answer 1

#include <stdio.h>
#include <string.h>
#include <ctype.h>

void stringUpr(char *s){
int len,i;
len=strlen(s);

for(i=0;i<len;i++)
s[i]=toupper(s[i]);
}

int main(int argc, char* argv[]){

if(argc<3){
printf("Less command line arguments!!!\n");
printf("Use prg_name lower/upper \"string\"\n");
return -1;
}

if(strcmp(argv[1],"upper")==0){
stringUpr(argv[2]);
printf("Uppercase string is: %s\n",argv[2]);
}
else{
printf("Use either lower or upper!!!\n");
}

return 0;
}