ASCII stands for American Standard Code for Information Interchange and is pronounced with a hard 'c' sound, as ask-ee. It is a way of defining a set of characters which can be displayed by computer on a screen. Basic ASCII uses seven bits to define each letter, so it can have up to 128 specific identifiers. It is represented by a byte, where eight bit is set aside for error checking function.
int atoi(char * input){
int output = 0;
int sign = 1; // default positive sign.
int i =0;
if(input==NULL||input==’’){
sysout(“Invalid input”);
return 0;
}
if(input[0]==’-’){
sign=-1;
i=1;
}else if(input[0]==’+’){
sign=1;
i=1;
}
while(input!=’\0’){
int temp = input[i] – ‘0’;
if(temp<0>9){
println(“Invalid Input”);
return output;
}
output=output*10+temp;
if(output>0 && sign==-1){
println(“Input underflow”);
return 0;
}
if(output<0 sign="=">
println(“Input Overflow”);
return 0;
}
i++;
}
return output*sign;
}
Test cases:
| SNo | Input | Output |
| 1 | 123 | 123 |
| 2. | +123 | 123 |
| 3. | -123 | -123 |
| 4. | 123ABC | 123 and print a msg “Invalid Input” |
| 5. | ABC123 | print a msg “Invalid Input” |
| 6. | 99999999999999999999 | Input OverFlow |
| 7. | -99999999999999999999 | Input UnderFlow |
| 8. | NULL | Invalid Input |
| 9. | “” | Invalid Input |
Return output;
}
