lvalue required as left operand of assignment

lvalue required as left operand of assignment is a variable or element in array. lvalue can be something that can be seen on the left hand side of an assignment. It is typically a variable or a element array. Let suppose if we define int* p, then there p is an lvalue. p+1 is a valid expression. This is not an lvalue.

Misuse of the Assignment Operator

on Jun 16, 2022

#include <stdio.h>
// This code will produce an error
int main() {
int a = 26;
int b = 13;
if (a % b = 0) {
printf(“%s”, “It’s all good”);
}
}

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Mishandling of the Multiplication Assignment Operator

on Jun 16, 2022

#include <stdio.h>
int findFactorial(int n) {
int result = 1, i;
for ( i = 1; i <= n; i++) {
result*1 = result; // Here is the error
}
return result;
}
int main() {
int n = 5;
int factorial = findFactorial(n);
printf(“%d”, factorial);
return 0;
}

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Misunderstanding the Ternary Operator

on Jun 16, 2022

#include <stdio.h>
int main() {
int x = 23, y;
x >= 23? y = 4: y = 12;
printf(“%d”, y);
return 0;
}

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Using Pre-increment on a Temporary Variable

on Jun 16, 2022

#include <stdio.h>
int main() {
int i = 5;
printf(“%d\n” ++(-i)); // Error
}

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Direct Decrement of a Numeric Literal

on Jun 16, 2022

#include <stdio.h>
int main() {
// This is illegal, don’t try this
int x, y;
x = -4–4;
y = -4–(-4);
printf(“x=%d y=%d”, x, y);
}

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Using a Pointer to a Variable Value

on Jun 16, 2022

#include <stdio.h>
int main() {
int *p;
int z = 5;
p = &5; // Here is the error
return 0;
}

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Wrong Placement of Expression

on Jun 16, 2022

#include <iostream>
using namespace std;
int main() {
int y[3] = {3,4,5};
int *z=y;
z + 1 = z; // Error
cout << z;
return 0;
}

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Use Equality Operator During Comparisons

on Jun 16, 2022

#include <stdio.h>
int main() {
int a = 26;
int b = 13;
if (a % b == 0) { // Here is the correction
printf(“%s”, “It’s all good”);
}
}

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Use a Counter Variable as the Value of the Multiplication Assignment Operator

on Jun 16, 2022

#include <stdio.h>
int findFactorial(int n) {
int result = 1, i;
for ( i = 1; i <=n; i++) {
result *= i; // Here is the correct part
}
return result;
}
int main() {
int n = 5;
int factorial = findFactorial(n);
printf(“%d”, factorial);
return 0;
}

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Use the Ternary Operator the Right Way

on Jun 16, 2022

#include <stdio.h>
int main() {
int x = 23, y;
y = x >= 23? 4: 12; // The correct ternary operation
printf(“%d”, y);
return 0;
}

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Don’t Pre-increment a Temporary Variable

on Jun 16, 2022

#include <stdio.h>
int main() {
int i = 5;
printf(“%d\n”, (–i) * -1); // This should work as expected
}

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Use Pointer on a Variable, Not Its Value

on Jun 16, 2022

#include <stdio.h>
int main() {
int *p;
int z = 5;
p = &z; // This is right
printf(“%d”, p);
return 0;
}

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Place an Expression on the Right Side

on Jun 16, 2022

#include <iostream>
using namespace std;
int main() {
int y[3] = {3,4,5};
int *z=y;
z = z + 1; // The correct form of assignment
cout << z;
return 0;
}

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