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The "not equal to" operator in C is '!=', the "not" operator is '!', the "and" operator is '&&', and the "or" operator is '||'.  The condition in the following 'if' statement is true:

    if (!(4==5) && 6!=7)
                .
                .

In English, it says:  "if four equals five is NOT true, AND six does not equal seven...".

As a shorthand for the 'if' statement*, C provides the ternary (three-operand) conditional operator '?:'.  The value of an expression using this operator depends upon the value of its first operand.  If the first operand is true (non-zero), then the second operand is evaluated; else, the third is evaluated and becomes the value of the expression.  The operator may be mixed freely with other operators.  For example, the following assigns the value 12 to result:

    result = ((5==6) ? 5 : 6) * 2;

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146

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48179

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if-else statement

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if-else statement - p156